Looking to build a new Gaming Rig

Alright guys, so this is my first post on Tom's but i've been an avid reader for a few years now. I am the point where I want to building a new PC so i'm turning to you guys to get some help as i'm a bit rusty on what's what nowadays. Here goes:

APPROXIMATE PURCHASE DATE: Early - Mid June BUDGET RANGE: ~1700$-1800$ CAD (Not set in stone so i'm open to upgrade paths that may require a bit more $$$ upfront)

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming, web surfing, watching movies & burning homemade DVD's

PARTS NOT REQUIRED: Keyboard/mouse/speakers

PREFERRED WEBSITE(S) FOR PARTS: newegg.ca

PARTS PREFERENCES: AMD, Asus & Corsair a preference but i'm open to building a core i7 rig if it fits the bill

OVERCLOCKING: Yes SLI OR CROSSFIRE: Yes

MONITOR RESOLUTION: Whatever would make sense on a 22" or 24" LCD

ADDITIONAL COMMENTS:

A few things i'd like to point out. First off i've been hearing things about AM3 being dropped by next year so i'm wondering if it's worthwhile going towards something like a Phenom II X4 955 with DDR3 Ram on an ASUS AM3 board but if i'm shooting myself in the foot by doing so i'm all ears as to what you guys would suggest instead. I wouldn't mind going straight to crossfire and getting something like two hd4870's as long as they will sustain my gaming needs for a while. Regarding the OS i'm hearing mixed reviews about going to Windows 7 as opposed to Vista 64bit, am i better paying for Vista upfront to make sure i get solid drivers for the build or will i be ok getting Windows 7 for free now and pay for it before March 1st next year? Ram wise, would a 2x2GB kit be worthwhile so i can add on later or can i manage getting a 2x4GB without a huge price jump atm? Can't think of anything else off the bat but i'm sure you guys will point out whatever i've missed soon enough. Thanks in advance for the help!

http://www.newegg.ca/Product/Produ [...] 6811119194
COOLER MASTER Storm Sniper SGC-6000-KKN1-GP


http://www.newegg.ca/Product/Produ [...] 6822136319
Western Digital Caviar Black WD6401AALS 640GB


http://www.newegg.ca/Product/Produ [...] 6814102830
SAPPHIRE 100269SR Radeon HD 4890 1GB 256-bit GDDR5


http://www.newegg.ca/Product/Produ [...] 6817139006
CORSAIR CMPSU-750TX 750W ATX12V


http://www.newegg.ca/Product/Produ [...] 6820231247
G.SKILL 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600


http://www.newegg.ca/Product/Combo [...] mbo.193620
1. Intel Core i7 920 Nehalem 2.66GHz LGA 1366 130W
2. GIGABYTE GA-EX58-UD4P LGA 1366 Intel X58 ATX


http://www.newegg.ca/Product/Produ [...] 7136152CVF
LG Black 22X (CAV) DVD+R 8X DVD+RW 16X DVD+R DL 22X



$1490 without the m-i-r's.


Now theres many coolers that are good to get. Here's a list:

http://www.newegg.ca/Product/Produ [...] 6835233029
xigmatek

http://www.newegg.ca/Product/Produ [...] 6835103057
coolermaster hyper

http://www.newegg.ca/Product/Produ [...] 6835608007
noctua

then you will need thermal compound, arctic silver 5.

^ no the case is big too, and the 4890 is standard gaming card size, 10.5".

and acer are usually considered the best for the price monitor wise now.

Gotcha, what about the cpu cooler. From what i could see the Gigabyte mobo already has a backplate installed, is that going to cause any problems installing a cooler that requires it's own which seems to be the case with the coolers fullmetal suggested.