What PSU would work for a GTX 750ti 2GB

You really just need a low power quality power supply. An Antec 380W Earthwatt would do the trick. Here is one with $15MIR.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371033&ignorebbr=1

However, it doesn't give you much room for an upgrade if you'd like to get a more powerful card later down the road. Truthfully, I'd get something like the below. This is 620W for $55 after code (good till 1/1), plus $5 MIR making it $50. This gives you plenty of room to grow and the deal is ridiculous.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151095&ignorebbr=1