Gaming rig advice needed

APPROXIMATE PURCHASE DATE: (next week or two) BUDGET RANGE: £800 max

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: (gaming, connect to cisco linksys wireless N+router for internet)

PARTS NOT REQUIRED: (Monitor, DVD Drive, Floppy Drive, keyboard, mouse)

PREFERRED WEBSITE(S) FOR PARTS: (any non preferred price is king as long as they deliver to UK Mainland)

PARTS PREFERENCES: I would like to use an AMD 945 CPU & Gigabyte 790x UD4P mobo with a radeon 4870 HD Vapor X or toxic GPU id prefer an antec 900 case and will be hooking the pc up to my 32 inch lcd HD TV for now )

OVERCLOCKING: Yes at some point SLI OR CROSSFIRE: No

MONITOR RESOLUTION: (1920x1080 Monitor in future)

ADDITIONAL COMMENTS: ( I would like a quiet PC)

i just need a little advice to get me over the final hurdle i think before i buy
mainly gonna play sims 3, C&C3: tiberium wars, Footie Manager for now?

althought later i'll be getting more demanding games and a blu ray drive

i dont think i can use newegg.com as im in the UK

ive included prices and links where i could for what i have so far

CASE
ANTEC 900 - £75.63 +free delivery

http://www.amazon.co.uk/Antec-Nine [...] 752&sr=8-1

MOTHERBOARD
GIGABYTE 790 UD4P - £96.24 inc vat +free delivery

http://www.dabs.com/products/gigab [...] tml?q=ud4p

PROCESSOR
AMD Phenom 2 945

http://www.novatech.co.uk/novatech [...] GIBOX.html

GRAPHICS CARD
Radeon 4870 1gb vapor x (yesterday 07/09/09)

cbccomputers.com had this card advertised at £130.43 delivered now nowhere to be seen just a 2gb version for a much higher price so i'll be shopping around again to see what price i can get for one

£133
http://www.digital-fusion.co.uk/In [...] f=28592590

HARD DRIVE
500gb samsung spinpoint (trying to find the F3 but finding it hard to find bringing up 1tb option)

http://www.aria.co.uk/Products/Com [...] ctId=33024

RAM
would like ddr3 1600 or 1333
Whats recomended price for punch i dont know much about RAM

PSU
Same Again Not too sure about PSU's

wireless Network Card ???

cheers from phil