First time video card buyer...help!

I am wanting to purchase a new video card for my Dell E521 which currently has Radeon x1300, and a AMD 4400+ dual processor. I do like to game and currently am trying to play Assassins Creed and Rise of the Argonauts, both of which require something more than what I have now. If you could let me know what you would recommend, my budget would be <$100.

One that I have found is: for $69.99
EVGA 01G-P3-N959-TR GeForce 9500 GT 1GB 128-bit GDDR2 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail

This seems like a good deal. Please let me know.

HD 4670 or Geforce 9600GSO or 9600GT. Probably your best two options. But the 9500GT isn't anywhere near either one in performance, but the cost is very close.

Dell E521 on google shows a mid tower.

The 9500gt is NOT a good gaming card. The 9600 series would be a good choice, but it uses more power than you have.

I'd recommend going with a 4670, it will perform like the 9600, use less power, and it is cheaper I believe. The link dirtmountian provided is a good choice for a 4670.

Thank you very much for your input. Looking at newegg I was able to find this which seemed to be a good deal and it received really good reviews. If there are any cautions or better cards, please let me know.

For $80.99
HIS Hightech H467QT512P Radeon HD 4670 IceQ Turbo 512MB 128-bit GDDR3 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
Overclocked to 780MHz and fast, quiet IceQ Turbo