iMac with GeForce 120gt ?? Enough?

I recently order a refurbished iMac and wondering if I made the right choice. I'm a desinger that uses cs4 no real gaming but I might be at some point. I did alot of research and think I made a good choice but I still would like to hear your opinons.

iMac 24"
2.98 ghz
4g ram
Nvidia GeForce 120 gt

good for cs4 or cs5 and light gaming??
I rarley render. 3D but ocasionally
I use a middle of the line toshiba laptop right now

I'm actually cruising the site with the same question. But wondering if that iMac would also work well for some HD video editing in Final Cut Pro.