I play on 1680x1050resolution....i
GeForce GTS 450 (~£95)
Exceptional 1680x1050 performance in most games, 1920x1200 in most games with lowered details
This is from Tom hardware gpu charts. So your card is good but not future proofed.
I repaste my CPU every 6 months as the paste become less affective over time, but then i usually have a new cooler every six months.