I am planning to buy gtx 750ti (considering the fact that it won't need high powered PSU). I am currently using a non branded PSU(500W). Will it be enough to handle it?

I am not buying mid range GPU for long time cause have to change PSU and casing which I think is a hassle to me. Currently using HD 5670.

Please suggest a 21.5/22 inches monitor within 12000-13000. I can extend it up to 15000 but it must be good looking and able to 1080p gaming.

Thanks in advance.