GT 440, GT 430
HD 6670, HD 6570.
Maybe even a GT 630, GT 620
Believe it or not, this is not a troll post, and should actually be taken seriously. The GT210 is not a gamer card. It is so weak, that even the lowest-priced of the Tom's monthly Best Graphics Cards for the Money selections will be vastly superior; as this post indicates, it is not necessary to spend a lot of money even for a remarkable improvement.
With a budget of $100, look for a GDDR5 version of the HD6670; they start around $90. If you'd like to stretch to $110, the HD7750 is an even better choice.
Your PSU is not good under load (summarized by HardOCP as a "polished turd in a box"), however it should be fine for any of these cards, or even stronger ones.