Just tryin to help ya out a bit here
1st
Ditch the Aspire case and get a good one, you'll be glad ya did. The cdrom doors are chincey & the temp gauge is not very accurate. Your going to spend $60 on a cheap case then another $60 on a decent P.S.? Just get a good chassis without a P.S. or a good chassis w/good P.S.{works out to about the same amount of $$$}
2nd
Get the Epox EP-8RDA3+ instead, again you'll be glad ya did {theres a reason why the AN35N is $21 cheaper than the 8RDA3+}
3rd
Use the XP2500+ Barton chip, not the moble
4th
Get the WD 80GB SATA HDD, it's quieter, has a three yr warranty instead of one, costs less, produces less heat and is faster
5th
You'd also be better off to get the 128mb Radeon 9800Pro over the 256mb model. You won't see any better performance {espeacialy in AH} than you will with the 128mb version and you'll save a few dollars to spend on better RAM.
6th
Get the Corsair XMS DDR PC2700 or 3200, not the value stuff {your chip is a 333 chip}