What budget do you have, and what does the rest of your system look like? Most anything is better than the card you have, but going too high end wouldn't help a lot if your CPU is going to hold you back, or your resolution is low.
Ok thanks. would it be good for running DayZ/Arma 2 and 3? Would i need to purchase anything else or just the card? Thanks.
Can you post the a more complete list of the specs of your system? I can't find it in the Internets. Aaanyway, with a core i3 and 4gb of RAM, the 7770/650 ti would be able to beautifully play Dayz and Arma 2. However, Arma 3 is still in the alpha so I'm not sure that the current system reqs that it has would stand.
Hmmm. More upgrades? I suggest getting an additional 4gb of RAM. While 4gb is the bare acceptable minimum for a gaming rig, I see a lot of setups today (including mine) run on 4gb. Unless you want to get a new CPU, you're as fine as you go.