I's get a x2 4200 or an opteron 170 for $400 instead of the single core 4000.
Mobo wise... I don't like ASUS, but if you like them that's cool. As for buying that board... it's more of a rip. I've also heard people hate the cooling... I'd get a DFi or Abit or MSI SLi board that's cheaper and most likely better. (If you want it 'caue it's x16 SLi, I think the best MSi model is x16 too and it's only 190 w/ onboard creative sound.
Ram, $200 for 1gig? Naw you don't need that get some Corsair or OCZ 2 gig (2x1gig sticks) for the same price. I dunno about the Corisar, but OCZ get platnium at the least and you'll be good.
Aspire case= good
Aspire psu= bad
Get a nice psu from and afore mentioned brand.
For $40 you can nab a NEC DVD Burner... much better deal all around.
The NEC floppy is only $7.50 also... not promoting them or anything, I just don't like Sony and the NEC floppy is cheaper. (last time I looked)
GFX is good, I'd hold off on buying another for SLI (assuming you are with the sli board and high watt psu) till Vista and DX10 cards are out, then you can see if it's worth upgrading to DX10 compatible cards or just getting another 7800GT.
In The Mail!!!!- Athlon 64 3500 @Stock/Abit K9N SLi sAM2/2GB G.Skill DDR2 800 @Stock /XFX G7900GT XXX 520/1500Mhz/74GB Raptor w/ 16mbcache/300GB 16mbcache SATA HD/NEC DVD-RAM Burner/OCZ ModStream 520watt psu/ThermalTake Armor Jr./Logitech EX110 mouse/keyboard