I like Tiny Voices build. Personally I prefer AMD but it's hard to argue with a dead on budget build. No reason to change anything there, it should perform very well.
You can drop the DVD reader if you don't think you'll need it. My PC doesn't have one, and might never have one.
Edit: Answering you question: http://www.tomshardware.com/reviews/geforce-gtx-660-geforce-gtx-650-benchmark,3297-7.html
Keep in might that is using OLD drivers. Performance should be up slightly for every card there, but don't expect miracles.