I work for a company that used to carry Alienware and I will tell you that it is not at all worth the money. No offense against them but what they do is take a nice mobo chip and throw in ATI's most expensive card put it in an old radiator box and mark the hell up outta it.

If you are worried about case size I looked at this website a while back which has a LOT of cheap big cases...

Since you have already picked out your PC, I guess all this will be recommendations for anyone else looking at getting a new pc.

I personally recommend that anyone getting a computer for gaming stick to either a p4 or a AMD athlon not the celeron chip... It just doesnt have the throughput for maximum performance. If you do use your computer for gaming make sure you check out this site on how to set up a seperate account just for gaming that will reduce the services and unecessary crap running in windows xp. You also will want to look at different cooling options (water, fans, holes, seperate airconditioner, etc...)
When getting a vid card, if you go with ATI you want one with the keyword PRO and with GeForce you want ULTRA. RAM you want either DDR 2700 or higher (3500, 4000, dual channel ddr)

ill throw some extra sites on here if anyone does look for a new pc and let me know if you have anyother questions on this topic

http://www.zipzoomfly.com/jsp/Home.jsp (formerly googlegear)
http://www.spartantech.com/
http://www.kingston.com
www.newegg.com
http://www.pricewatch.com
and many more


PS. On a side note: Gore I hope you got the warranty on that CPU, not that I work for anyone that sells them or have seen them go bad but just a hint *wink wink* IF not you have 14 days to get it. If you msg me I can give you a couple more reasons why you want it.