Yes the PSU is adequate, but leaves no room for upgrades and would not be a keeper. Something I would have in the cupboard for emergencies or leak testing.
It sounds like you want to save some money, I would make a hybrid of what you have already.
Your mobo is perfectly serviceable. Put your budget on a solid PSU, a GTX 970 or a new AMD card if decent, and SSD.
Find a second hand sandybridge or ivybridge K processor and a new, well reviewed cooler. You'll have a new system for half (ish) the price.