yes it is compatible as long as your mobo has a pci express x16 slot which yours does.
9500gt won't be a super card however it would perform about 40% better than your gt210. So yeah there is no reason why you shouldn't upgrade. You psu is more than sufficient since 9500gt doesn't even require an external power connector.
I enjoyed my 9500gt 5years ago. Takes me back
my pc specs are all craps.. =(
if only i'm rich.. i can afford to buy high end pc components..
btw.. this weekend i planned to change MoBo 1st..
i planned to buy Asus M5a88-m .. is it a good board?
thats all i can afford.. tsk..tsk.. i'm poor.. hehe