You still have a pretty decent system there. Does it struggle with any games ?
I would get a bigger SSD if you only have a 60GB one. Your 650W psu is fine for any single gpu, assuming it is a good make.
I just upgraded from the crosshair v formula z + FX8350 sold them for £200 within 24hours of advertising.
Purchased Maximus VII formula and 4790k and the difference it has made has blown me away !