What do you think? There's a few pounds difference and I don't want to go any higher than these. I've got an i3 2120 and a 450w Coolermaster PSU. I'd preferably play at 1080p but anything above 720p I would be happy with.
And the difference between these two cards is very little, depending on games. Get 550ti if few pound is not a problem for you. They are almost similar in performance but 550ti is a little higher in some games.