Need some ideas for new card please

Hi, i just wanted wo know which graphics card i should get.

my pc (very basic) but works gd enough for me last 1 i had was athlon 1800xp years ago.

http://www.currys.co.uk/martprd/pr [...] 201/140749

at the moment it has a hd3200 which tbh works rally well for onboard.

i have £150ish and want to get some ram too (not sure about types or nothing rly need help on this too).

i know that i will also need a new psu too so any advice on that would help too (i think that mine is 250w).

if it makes a massive difference i could probable get more cash.

my estimates are:

£40 for psu (i would rather get a decent psu as im planing on building my own pc in next 6 months (does it matter if you use a psu that is alot more powerful then u need)?

£30-£40 for RAM ( i dont know nothing about ram and would like to get another 2gig. does it matter if the current ram is different to a new 1? because im guessing the 2gb already in my pc is not a good type.

£70-100 for graphics card i wan to be able to play games in a decent res (playing unrealtournement on 640/400 (i think) is not fun lol

first thing i will probably get is the psu because im guessing prices dont change that often.

thanks in advance

GPU: http://www.scan.co.uk/Products/512 [...] DVI-I-HDTV

Ram: http://www.scan.co.uk/Products/4GB [...] ffered-CL5

PSU: http://www.scan.co.uk/Products/450 [...] ctFeatures