Best 512 MB card(or higher) for an Inspiron 530 with out upgrading power supply?

I bought an Inspiron 530 recently. When I called Dell tech support and asked about a 512 MB card, I was told that I may have to upgrade the power supply. He suggested me to buy Nvidia 7200 GS, but I wanted a better performing card which he said will require upgrading power supply.

Specs -
Intel® Core 2 Quad processor Q9550
3GB Dual Channel DDR2 SDRAM at 800MHz
Integrated Intel Graphics Media Accelerator 3100

Can somebody suggest to me better performing cards(with out upgrading the power supply)? Currently I use my computer for photo and video editing, but it would be nice to have decent gaming capability. I prefer Nvidia cards because of better Linux support.
Thank you.

Started this thread based on a forum member's suggestion to start a new thread .

My resolution would be 1920 x 1080 resolution. Also, it would be nice to keep the price in $50 - $75 range if possible.

I think I was not very specific in my earlier posts.

Good photo and video capability is a must for me. I take 1,000s of pictures every year. With the integrated Intel 3100, when I click next picture button(6 MP resolution), there is a time lag when the picture will appear blurred first, and then sharpness is gradually improved. It is very annoying to say the least. A new graphics card should make picture loading fast and smooth, thats the goal. I will be upgrading to a 10 MP or 12 MP DSLR shortly, that is why I am trying to get bigger capacity and better performing card now itself.

Games are not important for me. I play a single game(purchased few years ago) once every 3 months or so. As long as it is not jumpy or blurry I will be happy . Lower resolutions for games is perfectly acceptable for me. Thank you.

this should do the trick.
http://www.newegg.com/Product/Prod [...] 6814125251
if you need more power you can get this.
http://www.newegg.com/Product/Prod [...] 6814131151

Yeah i would definitely stay in that range of cards as they should do just fine in your game....

Thank you for all the replies. I am looking at some of the suggested cards. I was told by Dell representative that the computer can take PCI Express x16, but does that mean I can consider PCI Express 2.0 x16 cards also? Thank you once again.

Yes they are as AKM said backward compat.

2.0 is just an increase in bandwith and current cards cannot max out 1.0 bandwith so you will see no performance loss with your card choices atleast