Build For Friend, Need Recommendations

It looks good, but there is some room for improvement. That motherboard should go. I'm not sure if you had a reason for choosing a micro-ATX board with on-board graphics, but you'd be better off with a P45 chipset. Here's a few options:

ASUS P5Q Pro LGA 775 Intel P45 ATX Intel Motherboard - Retail
http://www.newegg.com/Product/Prod [...] 6813131299 $129.99 - $15.00 MIR

GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX Intel Motherboard - Retail
http://www.newegg.com/Product/Prod [...] -ep45-ud3r $119.99 - $15.00 MIR

GIGABYTE GA-EP45-UD3P LGA 775 Intel P45 ATX Intel Motherboard - Retail
http://www.newegg.com/Product/Prod [...] 6813128358 $136.99 - $20.00 MIR

Intel chips aren't very affected by RAM speed. You'd be better off getting a quality DDR2 800 kit like these:

mushkin 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail
http://www.newegg.com/Product/Prod [...] 6820146731 $49.99 - $20.00 MIR

or

G.SKILL PI Black 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail
http://www.newegg.com/Product/Prod [...] 6820231209 $49.99

That video card is OK, but if you get a crossfire board you might want to check out the ATI 4850. It's a faster card and allows the option of crossfire in the future if you go with a crossfire motherboard.

I agree with shortstuff on the P45 board and the DDR2 800 RAM, both very sensible moves. I'd also think about going with an Antec 300 case instead of the 900 to save an extra $40-$45 depending on shipping costs.
http://www.newegg.com/Product/Prod [...] 6811129042
The PC Power and Cooling 610w is going for $60 after rebate right now, a great buy and plenty for that system, even if crossfired at a later date.
http://www.newegg.com/Product/Prod [...] 6817703005
Also agree with shortstuff about a HD4850 instead of that 9800GT. Trying to get the budget down a bit because if your friend is a real audiophile he may not be happy with the onboard sound, research the Asus Xonar sound cards, I'd have him try onboard sound first, but try to keep a soundcard in the budget if he wants to upgrade it.