Hardware uppgrading for cataclysm?

[Eloxy]

Hey peeps!

I didnt read up much about hardware and wahts top notch and best bang for buck these days, but anyway im interested in a hardware uppgrade so i can get a lagfree experience with cataclysm with better visual quality.

This is my current system:

Geeforce 285 PCI-Express 2.0, 2xDVI, HDCP, HDMI, Core 240x2, Graphics Plus, CUDA, 55nm GFX
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ASUS Silent Knight II CPU Cooler, Blue COOLER
Light, Socket 478/775/939/940/AM2/AM2+
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PS changed to:
Corsair Powersupply 750W Black, ATX/EPS,
140mm Fan, 8xSATA, SLI
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Cooler Master HAF 932 ENCLOSURE
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RAM changed to:
Corsair XMS3 DDR3 1333MHz 12GB CL9
Kit w/6x 2GB XMS3 modules, CL9-9-9-24, for Core i7
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Intel Core� i7 Quad Processor i7-920 CPU
4,8GT/sec, 8MB, Boxed
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Motherboard changed to:
Asus P6T Deluxe V2, X58, Socket-1366
DDR3, ATX, SLI&CrossFireX, Firewire, 2xGbLAN, 3xPC
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Microsoft Windows Vista Home Basic OS
SP1,OEM,DVD,64

I dont realy know waht the bottleneck is here atm, and i would realy apreciate som input on what to change/uppgrade etc.
All input apreciated all from whats a cheap uppgrade, to what only bill gates can afford.

Cheers!

[grap]

and which kind of hard disks and ssd ?