.....7.1 systems until later, when you can add a 6th and 7th speaker if you want (you probably won't but if you do make sure it is a perfect match to the other two surround speakers). You need a 7.1 system mainly if you have a very large rear area in your room that you need to fill with surround sound because of a gap with the 5.1 system. Concentrate on a good 5.1 system for now. The 4th and 5th speakers go on the side walls. If you have room behind your seating area and can afford the extra cost of a 6th and 7th speaker now, then fine, but remember now you will have two more speaker to mount and more wires to run a long way, lots of work.!
Secondly, there is a review of the 990THX in the November issue of Home Theater Magazine available at your local newstand. It's a so-so system for the money. The THX certification in this price range is mostly hype. Don't buy based on it.
Thirdly, don't buy based on HDMI, there are ways around it.
Fourthly, get the best speakers you can, this is where the sound is. More importantly is how to set them up in your room. Room acoustics and how it affects the sound of your system is the most important thing you need to know.
Fifthly (?), Look where the best bang for the buck is. I'm going to copy a post I made for another person. Right up your alley price wise.
Sixthly (??), if I haven't missed it give us some info about your room dimensions, music likes and volume levels.
Seventhly (???), Forget bass reflex versus acoustic suspension, etc. Both designs include excellent speakers.
Eigthly (????), Forget the power ratings of speakers and trying to match them with the power ratings of the receiver and impedence (how many Ohms) rating, etc. Most all normal type speakers in the range you will be looking at are compatible with each other. The only term you are intersted in is speaker sensitivity (also called speaker efficiency). It tells how loud a speaker will play with a given amount of power. It is a way of telling which speakers are more or less efficent and might take more power than other speakers to play at a given volume level. It is only of interest to you at this point if you play your music extremely loud and/or have a very large room. If this is the case let us know and we will make sure you go for speakers that are at least average or better yet above average in sensitivity, look for a rating of 88 or 89 and above. This rating is in dB's (decibels). 86 or below is on the low side. 87-89 is about average and 90 and up is above average. The other way to play loud is with lots more power and that is very expensive. Most of the receivers in your price range, about $250-$400 will have about 75-100 watts per channel which is fine.
Ninthly (?????), I hope this all helps and is not to lengthy (except for Stewie).
RR6
Here is my other post:
OK, Now That We Have Found.....
....that extra money here are several systems that are both super systems for the money.
#1 The SBS-01 system from SVS and the Yamaha HTR-5960 for about $1330. This is an awesome system for the price with enormous low bass response. Read the review of this system at Audioholics.com.
http://www.svsound.com/products-sys-sbs_black.cfm
http://www.pricegrabber.com/p__Yamaha_HTR_5960_Receiver_Black,__18407558/sort_type=bottomline
#2 This system I mixed from JBL Northridge Series, which is discontinued, thus the steep discounts, great prices. I matched it with a sub from Outlaw Audio and the Yamaha receiver.
http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=298541&is=REG&addedTroughType=search
http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=298518&is=REG&addedTroughType=search
http://www.jbl.com/home/products/product_detail.aspx?prod=E20&CheckProduct=Y
http://www.jbl.com/home/products/product_detail.aspx?prod=EC25&CheckProduct=Y
http://www.outlawaudio.com/products/lfm2.html
http://www.hsustore.com/stf2.html
I suggest the single JBL EC25 center speaker with four JBL E20's for the left, right and two surrounds. $268.90 for 5 speakers that listed for over $750 (you could go with the larger E30 for the left and right for about $25 more). These are available in black, cherry and beech color from B&H.
Add the Outlaw LFM-2 sub for $299 and the Yamaha HTR-5960 for $332 for a system total of $900. (For a larger 10'' sub that goes even lower, add the HSU STF-2 sub for $100 more) This is a great small system! I didn't know until today that these JBL's were still available. Don't be fooled by the 8'' Outlaw sub. This a very high quality sub. I recommended it to another poster here and he bought it and was very impressed both by its performance and looks. It has an inlaid plexiglass top and looks gorgeous. It will outperform most 10'' subs and it goes down low for its size, about 25Hz in room response. The HSU STF-2 has even better performance.
I just purchased myself the larger Outlaw Audio LFM-1 Plus. Outlaw, SVS, HSU and JBL Northridge series speakers are all excellent buys at these prices. Outlaw and SVS are direct to the consumer companies that have outstanding reputations for quality products and customer service.
I have to disagree that one always need to audition speakers. They will sound very different in your own room. Undertsanding room acoustics and how to place your speakers is very important. I put a lot of value into reading many pro reviews and have not been disappointed. Outlaw, HSU and SVS have satisfaction guarantees.
Both of the above systems are significantly superior in my opinion to the Klipsch and Polk systems you mentioned.
RR6
To add a DVD player, the Oppo DV-970HD for $149 direct from Oppo, www.oppodigital.com looks like a great choice.