Advice on PSU/CPU/Motherboard/Memory for new computer

So I'm building a new computer for a little Christmas present to myself, not doing anything "all-out" by any means. I am looking for a computer to play games with and that will last me a number of years (the one I'm using now I've had for around five years I believe) which is why I have been looking at the quad-core processors. I have also been looking at dual-core to maybe grab one for cheap and then when quad-core drops in a year or so upgrade to one of those, but anyway here is what I have so far.

Case: Cooler Master 690 with 4xScythe Fans replacing stock ones.
Media Drive: Samsung CD/DVD Burner w/ LiteScribe
Hard Drive: Western Digital Caviar 500GB 7200RPM 32MB Cache SATA 3.0
Mouse: Microsoft Sidewinder Mouse

The items below are the ones I'm looking for feedback/advice on (i.e. is this PSU sufficient for one video card including the processors below, or is it too big/small):
PSU: Zalman 750W 80Plus Certified Modular PSU
Video Card: Sapphire Radeon HD 4870 512MB

And the ones below are just...'wtf' for me:
My first option is: Core 2 Duo E8x00 with OCZ Reaper 4GB (2x2GB) DDR2 800
My second option is: Core i7 920 with G. Skill 6GB (3x2GB) DDR3 1600

For both options I have no idea what motherboard I would like (or which I should use), and for the first option the processor depends on if I will be looking to upgrade in a year or so. For the Core i7 I was looking at Foxconn BloodRage for it's layout and the cooling setup it looks like it has, but I know it's designed as a purposeful overclocking board (which I won't utilize). I am on a slight budget, and would prefer no more than $300 for a motherboard.

I'm looking for general input on the motherboard, processor, power supply, and memory. The video card, case, etc., etc. I have done my research on and decided those are the ones I want for my needs.

Thanks,
Alex

should i go with the 850w PS even if i'm not planning on running crossfire ever? as for overclocking, it wont be that much if at all

http://www.newegg.com/Product/Prod [...] 6814121294 though it might be worth the wait untill jan and feb when NVIDIA realease gtx 295 and new tech comes

so at least for now, the card i have will hold =). im not playing top of the line games, partly because of school, the other part because of RL, wow, and cs:s, so the 512 4870 will hold me fine for now.

thanks for the input, i've decided on the core i7 also =)

cool, thanks for the help guys =)

that is the memory i had haha =) i went and looked and noticed that lactency was 7-7-7-20 and was like wow.

anywhoo, thanks, new computer being ordered tomorrow