Inspiron 570MT Upgrades

Hello,

So I think it is time for a GPU upgrade. I currently have an ATI Radeon HD 4200 and the husband wants to get me a new videocard. We were at Bestbuy and he picked up an ATI Radeon HD 5500/5600 and looked at me with this face that screams "Meh?"

Well, I have a 300Watt PSU and I read the box to see the card requirements and it said 300+ unless I am playing dual mode, then its 400+.

I am thinking of getting a new PSU to maybe get a better graphics card if my case can fit the new PSU and the videocard.

Any suggestions on a compact PSU (350-500Watts)and a compatible graphic card that will boost my framerates per second.

Feel free to ask for any additional info, I'll be around.