USA. So we are not familiar with the Argon except as an industrial gas. And, we don't know what is available to you, where ever you are located. Basics remain basics, however.
True, there is considerably more source material of entertainment that comes with 5.1 sound than 7.1. Some folks are considerable surround sound/home theater fans. (Not me, so much.) Yes, a 7.1 setup simply had an extra pair of surround speakers, usually placed to the rear. Yes, I have rudimentary surround, 5.1 for my great room with big screen TV. I needed to compromise about space for speakers, etc. but am firm that my great room is primarily to be maintained as a living room & not become less comfortable furniture like than necessary. It is NOT primarily a dedicated home theater. I do get benefit of basic surround for the total experience without losing a room in which to live. 5.1 is plenty for me, as I also have the center channel & sub woofer. In the end, always an individual decision.
I would be prone to lean towards the KEF setup.
About receiver & speaker power numbers: Don't get caught up in confusion. Speakers are often labeled as to the maximum wattage they can handle. That would be a maximum volume. High power output by amplifiers does not kill speakers. If anything, insufficient power does. When insufficient, maximum stress occurs, distortion is maximized, perhaps destructively. In addition, power hungry speakers, (but because of imposing a difficult load due to low impedance like 3 or 4 ohms, ) stress underpowered amps to the point of their distortion, too.
Don't worry about an amp being high powered. That is just capacity, not the norm.
Here are a couple of questions that I have.
1) I am planning to purchase a speakers set for my guest room (home cinema, and maybe XBox or PS3 later) which not that big and here are three options I am considering:
argon 7000 (5.1 system)
onkyo HT-S990THX (7.1 system)
KEF KHT3005SE (5.1 system)
Could someone tell what would be the best choice in this case? I mean quality wise.
2) Does anyone benefit from having 7.1 system against 5.1 system? Since most of the audio sources (except for games) will have 5.1 sound, what would be the reason for buying 7.1 speakers.
3) Argon will require to purchase an amplifier separately. Is there a resource on the web that would help in choosing an amplifier. Since the speakers power varies from system to system, how do you choose an amplifier and then if it is a bit too strong how to you make sure it does not kill the speakers.
Thanks a lot for your answers!
have a good day.