[New System Build] Mobo and Video Card

1. I just used a P5Q-? (don't remember) on a build for my sister's family, and had no trouble with it. Her husband will do real work on it, however, so I did not overclock the Q6600 I used.
2. An HD4670 will do a fine job on WoW for <$90. If you'll play other, more demanding games, maybe step up to an HD4850 for <$180.
3. Get RAM that will achieve its claimed timings on the JEDEC standard (and default) 1.8V. Mushkin and A-Data make sets that I have used.

I'd pick the P5Q Pro instead of the P5Q Deluxe. Cheaper, and has no issues with large CPU coolers. OK, if you don't overclock you don't care about the coolers not fitting, but the price is still a factor. Check out the GA-EP45-DS3R too.

How about a Corsair 650TX? You can have that for $72 at www.buy.com.

RAM: get this one:
Mushkin 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 $53
http://www.newegg.com/Product/Prod [...] 6820146731

Video card: since you're saying "mainly for gaming", "Price is not necessarily an issue", "maximize FPS", I'd suggest something better than HD 4670. HD 4670 may be fine for WoW, but it will disappoint you in other games. Consider a HD 4850 at minimum, or even a HD 4870 1GB (if gaming on a 24" monitor or larger). For example P5Q Deluxe + HD 4670 costs about the same as P5Q Pro + HD 4850 but has only 40% of the graphics power.

One more thing: if you're going to have a TV tuner and lots of hard disks, get a 750TX PSU. That will leave enough room for upgrades, including adding a second HD 4850. WoW does NOT need a second HD 4850, even one is overkill, but if you get sick and tired of WoW and try something else it's good to have the Crossfire option.

Cool, go for it. BTW, I think this weird pricing is because Intel wants to discontinue the E8400.