Help with my new gaming rig 1200-1400 dollar budget (CAD)

Hi, I am looking to buid a new PC in December. Although I am no slouch when it comes to general computer knowledge I am really indecisive on which CPU and GPU would be best for me. I have obsessed over benchmarks and comparisons for the past few days and each chart I see just makes me even more undecided, the question of Do I splurge on the Core 2 Duo, will it really give me that much of a boost over the AMD processors, any and all help in this section will be GREATLY appreciated.

Second is GPU, I currently have a eVga nvidia Geforce 7900GS 256mb pcie which I am in love with but I have been trying to look at the horizon and what is just over it for DX10 cards and I dont know what is there should I buy a new graphics card even though none of the ATI HD or Nvidia 8800s can play DX10 at a decent frame.

I shop at www.tigerdirect.ca (I am Canadian) post your possible builds for me and answering any of my questions would be appreciated, my budget is 1400 thank you.

Directcanada.com has some very good prices too. Free ground shipping on everything if your order is > 300$ and < 100lbs, that's pretty nice. Redflagdeals.com and Pricecanada.com are your friends.

Personally for the CPU I'd go for the E6750... and since you already have a more than decent graphics card, I'd wait for the Geforce 92 (or something like that) series to come out.

E6750 Core 2 Duo is an awesome buy right now from a bunch of places for just over 200. Very easy to overclock quite a bit. Should last awhile also.

I mentioned that above the q6600 at tigerdirect is extremely overpriced it should cost approximately $330 canadian. I'm telling you man, use the sites mentioned above and not tigerdirect, you're only hurting yourself.