(Not sure if this shouldn't go in "Hardware and laptops", but as that is more about problems getting hardware to work, I'll post here)

Currently my machine has an Asus ENGT430 graphics card (so basically Nvidia GT430). I am not (yet?) much of a gamer, so for now this works just fine. Should I want to upgrade to something with a bit more oomph, what would you recommend?

Constraints:

- price: I know I could go out and buy a €500 card, but let's say I don't want to spend more than €100 (that would mean $100 for hardware on sale in the US).

- power: I have a 300W PSU and don't want to replace it just to accomodate a graphics card.

- brand: considering Linux support, it should have a Nvidia chipset.