So, I think it's time my 9800GTX had a relax. It has had a good life- however I think it is time for it's retirement
I am looking for a new card with a budget of £250 to work with the rig in my sig. I do a lot of gaming and am looking for this to last me a while. I had my eye on a GTX 480 SOC from Gigabyte as they seem to have tamed it with their cooling solution which is apparently very quiet. I have also heard that the performance is very close to that of a stock GTX580 which excites me massively! The only thing putting me off is that I will not have the future option of adding another in SLI due to my motherboard being a Crossfire-only board. What are your opinions on this?
I would appreciate any recommendations of card, as long as I am getting good value for money. Second hand is also a good option that does not worry me. I would also like it if you would put in a recommended PSU wattage to go with it as it is clear I will have to upgrade my CM M520 PSU.

I would appreciate any recommendations of card, as long as I am getting good value for money. Second hand is also a good option that does not worry me. I would also like it if you would put in a recommended PSU wattage to go with it as it is clear I will have to upgrade my CM M520 PSU.