I do a lot of gaming and recently I have been getting errors where my GPU crashes screen goes black and any game I am playing crashes, so a GPU upgrade is at the top of my list. I was also contemplating upgrading my SSD to a higher capacity so I will be able to install games on it. Thanks for your time and help.
I don't think you'll be needing another cpu or mobo, the one you have is a good one.
You'll need a new card, the psu i don't know the brand can't say, and the ssd.
You can get a 670/7950 in newegg+ m4 crucial 128GB for less than 600$
That's all you need for any single gpu card, it's quality is flawless, you won't find any better psu.
As for the card, i don't know your preferences, but either a 670 gtx or a 7970 + a 128 ssd crucial m4 or samsung 830.