you should be fine, currently im using a gts 450 @1080p and MOST of the games i play can play with atleast over 30fps with highest/medium settings, i never lower it passed 1680x1050 so you should be fine in that category, since the gtx 550 has the same cores, but a higher clock speed, as for the cpu, you should be fine and not bottlenecked, the only way i can see you bottlenecking yourself is if you had a dual core with a low clock or anything like that,
and also, as DEY123 said, get an aftermarket cooler if possible, they help ALOT temp-wise and usually (but not always) are quieter