SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: DX11 Gaming > HD movies > Photo / Film editing > everything else
PARTS NOT REQUIRED: Screens/OS/Mouse & Keyboard/ - pretty much just need a new tower
PREFERRED WEBSITE(S) FOR PARTS: Ebuyer/DABS - but im open
PARTS PREFERENCES: AMD / ATI preferred but I'm open
OVERCLOCKING: Maybe SLI OR CROSSFIRE: Yes at a later date
MONITOR RESOLUTION: 1920x1200
ADDITIONAL COMMENTS: Mainly for gaming and HD movies + bragging rights I want to get as much bang for money as possible. I would like a newer screen at the same resolution as my current as its starting to dim, I would like a recommendation of a decent screen if possible this will eventually be brought after this build, but include if you can! that would be even better, but the tower comes first
Current Build :
4GB Corsair DDR2 XMS2 800Mhz
ASUS V2a M - Motherboard
Seagate 250GB SATA HDD
You're spending extra on things that don't get you anything.
Case: Switch to the HAF 922. It's almost as big, and is a lot cheaper.
CPU: The 955 is the same as the 965, just without a factory overclock. Save yourself the little bit of cash.
Mobo: The Crosshair series is extremely expensive and doesn't give you a whole lot. Check out the Gigabyte GA-890GPA-UD3H to get AMD's newest chipset (garaunteed to work with 6 core CPUs) or the Gigabyte GA-790XTA-UD4. They're both cheaper and a lot more future proof.
RAM: Find some 1600 mhz CAS Latency 7 sticks. Don't be afraid of other brands, as Corsiar is usually overpriced.
GPU: HD 5870.
PSU: 850W is a tad overkill. I would drop that to a 750W version.
HSF: Water cooling is overrated. Grab a Coolermaster Hyper 212 Plus and have one of the best coolers out there.
EDIT: BTW, this is what you can get for an equivalent amount of money in the US. You might want to check out the prices of the parts over there...