I asked what monitor do you use
, if it's not full HD or you don't game in that resolution your current card is OK.
You can keep the CPU/mobo/RAM they're still very good and upgrade at the beginning of 2011, both Intel and AMD will release new sockets. For now you can get a more powerful video card like the HD 6870, or wait for the new AMD 6950/6970 series that are scheduled for later this month.
You can get a CPU cooler like the Cooler Master hyper 212 plus and OC the CPU to 3 GHz (see the overclocking subforum).
LE get the Samsung Spinpoint F3 500 or 1T.