Looking to upgrade something in my computer!

[rawfuls]

Too all those computer buffs...

Well, just got the go ahead to pick up one thing for my computer.

My specs:

Intel Core 2 Duo E8500 @ 3.16GHz
Elitegroup G31T-M (Shut up.. It was part of the combo deal at Frys)
Corsair XMS2 4GB (2x2GB) DDR2 PC6400
Nvidia GeForce 7200GS/7300SE
Random Case from Fry's w/ 450W PSU

As you can see, my dad kinda cheaped out on the Case+PSU, as well as my Motherboard (kind of), and Graphics card...

Here are the links

CPU:
http://www.newegg.com/Product/Produc...-036-_-Product

Motherboard: (This is made by MSI, but mine is made by Elitegroup [ECS])
http://www.newegg.com/Product/Produc...0234&Tpk=g31tm

Memory:
http://www.newegg.com/Product/Produc...-184-_-Product

VGA Card:
http://www.nvidia.com/page/geforce_7300.html

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I got about $65 in Best Buy gift cards, and was looking into upping something.

I'm mostly a gamer, so I was looking into upping my VGA.

MAYBE to a EVGA GTS 250 512mb (DDR3) PCIE....

What do you guys think, I should upgrade, and if the VGA, which VGA?

Thanks!