Yes, thats plenty of wattage and enough amps on the 12v rail to support a GTX 750.
Some models require an additional 6-pin PCIe power cable, however, so check your PSU and make sure you have the required connector on your PSU if the card you're looking at requires one.
If your PSU doesn't have an additional 6-pin PCIe power connector you can find models of the 750 that don't require an additional power cable.