I have an Inspiron E1505. Pretty good machine !
Excepted if you are a power-user, it is useless to get the 2.0 GHz Core 2 Duo. This is not a gamer machine so the extra 2 MB L2 Cache will not be very usefull. Sure, if you make a lot of video/audio encoding, this is the best CPU you can get. But if you're a normal home-user, save your money or take the 7200 RPM hard-drive. The performance gain is better with the 7200 RPM HDD than the 2 GHz Core 2 Duo.
Make sur to get a DVD burner ... I think your option is only a CD burner. I'm not sure. Verify this.
The Intel PRO/Wireless option is the best.
For the RAM, sure, you'll get more performance weith 2 GB, but this can be totally useless if you only make web surfing, e-mails and word processing... If you want 1 GB of RAM, take the option 1 DIMM. You'll have a 1x1024 MB stick and a free slot for a future upgrade.
The X1400 is the most powerful GPU available for this model. I get 910 points in 3DMark06 with Catalyst 7.1.
On XP, you can get up to 6:30 hours of battery life with the 9-cell battery. If you think you'll carry your computer a lot, then, this could be a nice option to take.
The Sound Blaster Audigy HD is a software, not a hardware option. I think this is a software to optimise the sound of your laptop, something that slow down your computer start up ...
Pay attention to the screen option. If you're planning to read a lot on it, take the 1280x800 screen resolution. For a lot of multi-tasking / photo editing, then, a hier resolution display will be more appreciated.
I was just wondering which config is better