Thinking of upgrading

[Margaret]

I can currently take my PS3 back, well get a refund tomorrow for about 400 odd quid so I'm considering that since I don't think I'll even use it all that much.
Most the games I want this year are multi-format too and I already have an Xbox 360, I really do want Crysis, Bioshock and UT3 for PC though.

I was browsing another website I order from quite often that's selling a 768MB 8800GTX for £322.
Also thinking of getting another 2GB of my ram for 56 quid, very cheap.
I can get the GTX and the ram for a nice price new I'll just be a sad panda if I have to cancel the 2GB of ram and get a new PSU instead though.

Now that sounds great just wondering how does my PSU look when it comes to this?

My rails are:

It's a 500W Akasa PSU: http://www.akasa.co.uk/akasa_english/spec_page/psu/spec_ak_p050fg7_bk.htm

I'm abit of a noob when it comes to PSU and rails.

Also would a 7900GTO be able to sell for much?

I'll be gaming at 1440x900 too and hoping the 8800GTX would last me a while?

 

[Margaret]

Alright apparently my rails should just about cover it, fantastic!

 

[Margaret]

Alright looks like I shall be ordering this:

Just hope Quad Core isn't going to be a requirement for games at my res for a while.

I was looking at the 1GB 2900XT but they are bad? (and consume more power?)