Mid Gaming PC help.

Hi, I'm in need of a upgrade for my pretty old and getting on in time PC.

I mainly browse Internet and play games like Oblivion, FSX, Grand Theft Auto San Andreas, 3 and VC, Battlefield 2, Battlefront II, Simcity 4, Sims 2, and When I get it, Battlefield 2142, STALKER and GTA IV, I like to bump up the AA because I hate Jaggies, and I like to put the settings up as high as I can without lag.

I wanna play at good fps, and I am limited at 1280x1024 by my 3 Year old 17" LCD, so I don't really need a 640Mb GTS or something.

Anyway I might overclock a little, and I might go for SLi/XF later on when I have more money, and I need a PCI slot for my TV tuner card, and I want anything that will let me have Composite/Component audio Imput for my sound, as atm I can't use my VCR or PS2 on it with sound.
I live in Australia, would like to use this site to buy the stuff.

Personally, I don't mind if I go AMD or Intel, but keep in mind I'm only really gonna overclock if I need more performance, which hopefully I won't, same thing with the 8800/2900 battle .

This Is the Ram I selected
And This Hard Drive.
And This PSU.