Originally Posted by plinko
Or should I just suck it up and buy a full frame camera?
I can't speak much to your needs, but I can say the Canon 6D is great and affordable full-frame camera. It lacks the crazy fast autofocus and shooting speed needed for shooting sports that you would get with a 5D, but for studio work, landscapes, architecture and street photography, it's fantastic.
On that note, another consideration might be to look for an older 5D (MkI or MkII) with a low actuation count or refurbished shutter.