Hey, my friend wants to get a graphics card for his computer http://www.asus.com/Desktop/Entertainment/Essentio_CM67... . CPU: http://ark.intel.com/products/53445/Intel-Core-i5-2310-...(6M-Cache-2_90-GHz) . I have a 300W PSU as well, and my GT440 works famously, but I'm sure that my card is no longer a good buying option considering that it's now two series old. He is looking to spend under $70 and is willing to buy online. He'll probably get it sometime around summer and will most likely want a Nvidia card for CUDA and 3D Vision. It doesn't need to be a really powerful card, as his monitory is only 1280x768, but it does need to be able to run games such as Skyrim smoothly.
CUDA and 3D vision are simply not going to work on a 300W PSU, so I would not jump on the nVidia train for those reasons unless investing in a much larger PSU ($75) and a much larger GPU ($200+). Just look for the most performance per watt, and take what is available.
CUDA and 3D vision will not go well with lower Nvidia cards (same analogy for Physx). It is possible but not optimal. Unless you're really planning to buy a 3d kit which is obviously more expensive than your card.
For 3d and.such the budget will have to increase by alot.
For 3d id recommend a sli setup and physx an accompanied gt240 with another higher end card.
So you see wine taste on a beer budget doesnt work in this situation
A 6670 is best for the price on that psu that you can do with your budget