I'm building a gaming system and have almost all other parts selelcted.

I'll be putting a 9800 GTX in it and a single HDD. Raid not needed. SLI not needed. I'll be putting it in a Antec 182.

Here's what I need:
- socket for Q9300
- integrated sound
- integrated network
- PCI 2.0
- prefer full 16x PCI slots
- prefer low power consumption
- possible overclock
- fits Antec 182

Don't need:
- SLI
- Raid

Edited to say need PCI 2.0. Does this mean I need an x38 based board?

ASUS P5K-E WIFI
GIGABYTE P35 DS3R
GIGABYTE P35 DS3L
ABIT IP35 PRO

All of these boards are solid and i have on of them (ASUS P5K-E WIFI) and its solid and has better cooling compared to P5K-E and supports 1600FSB too

I edited my post to say I need PCI 2.0. Does that mean I need an x38 based board?

Nope PCI-E 2.0 is backward compatible with PCI-E 1.0 so u can use a
PCI-E 2.0 card (like 98800gtx) on a PCI-E 1.0 board

Yes, if you want PCI-E 2.0 you need an X38 or a 780i rather than P35. Maziar is correct though, you don't really need PCI-E 2.0 for today's video cards. If you really want PCI-E 2.0, for future upgrade reasons, then I recommend the GA-EX38-DS4. If not, the GA-P35-DS3L sounds just fine.

If you don't care about SLI, consider an 8800GTS 512MB. It can save you money compared to the 9800GTX. Speed is very similar, and you only lose the Triple-SLI feature.

Yeah i say go for 8800GTS 512 too also 8800GTX has dropped its price alot so u may consider it