[Solved] I7 860 gaming build

Here’s a new i7 860 build I’m about to start. Plan to make the purchase within the next week.

PARTS NOT REQUIRED: keyboard, mouse, monitor (have 19", resolution is 1280x1024) and a 42" 1080p sharp aquas plasma tv, speakers, OS (have Vista 32 bit temporarily, will buy windows 7 64bit within the first month, but 32bit should be fine to up to 4gigs anyways?), graphics card (have an HD4890 already)

I have decided to skip thermal paste and an aftermarket cooler at this point. I hope that doesn’t prove to be a dumb decision. I will buy a descent one as soon as better after market coolers come out for the 1156 socket. I also will not plan to run crossireX/SLi, but out of curiosity if I was to run a 4870x2 on a single PCIE 2.0 16x lane, will it break the card to x8/x8 or keep it at 16x because it is only one card.

CPU
Core i7 860 Processor Boxed -$330

MOTHER BOARD
Gigabyte P55m ud-2
The motherboard has been one of the tougher decisions. I still haven’t made my mind up completely, but I want to try to get a cheaper motherboard so I can put money away into other things. And as it is I probably wont be overclocking till I get an aftermarket cooler and like I said no crossfire or sli (maybe an x2 card though down the road) -$109

RAM
OCZ Gold 4gb (2x2) ddr3 1333 (PC3 10666) CL9 - $90

GPU
Already have a MSI HD4890

HDD
Western Digital 500gb hard drive 16mb Cache - $55

PSU
CORSAIR TX750w (non modular one) -$125

CD/DVD Writer
SAMSUNG Black 22X -$25.99

CASE
Antec 902 -$110.99

Total Cost: $846 CAN - Before Taxes

A couple thting that I'm still unsure of. Am I cheaping out on the Motherboard? if the power supply is overkill? how does the antec 300 case compare to the antec 902? seeing as I can get that case for $55 and put the money else were.

Also I'd like to keep my budget below $900 before taxes. And I'm a cash only guy so I'd like to avoid ordering online unless I absolutely get a better price.

The stores I'm using are

http://www.infonec.com/site/main.php
http://lucomputers.com/site/
http://www.tigerdirect.ca/

All these stores are relatively close to my house so I can pick them up.

CZ 550W Fatal1ty Series Power Supply has a rebate that takes the final price to $56

Thermaltake M9 case
Antec 300 case $55

and also since I'm just gaming, occasional photoshop and normal PC use, would an i5 750 be better?