Yep a little more ram might not hurt, even though you do have the minimum required ammount.. If you can double that, you can run it perfectly... But even like this, it should be fine too, since you already get reasonable performance.
Again, it's always a bit 'theorethical' untill you actual try, ofcourse. It might well perform better than expected with 2GB of RAM. The graphics card is more important.
Fred.