One, your melodrama is unnecessary!?!?!?! Two, I've only started using Apple products about a year ago and never had any experience with building a PC, so prior to researching Hackintoshing/PC building, I thought getting an iMac would be best since it's a "desktop" and a clean all in one. However, I found myself missing the performance of true desktop and after the new Mac Pro reveal, I decided that building a Hackintosh would be best for me. I mean, surely you've vacillated between several decisions before, did you think you're the first person to not backtrack on a decision you've made before?!?!
Clearly!
Your post makes absolutely no sense whatsoever. Who said anything about installing a GPU into an iMac?
I research my buying decisions fully before pulling the trigger. No better way to avoid buyer's remorse for big-ticket items. In fact, I spent the better part of 4 months researching Hackintoshes (and you're right, the difficulty of putting one together is much easier than it used to be, and tonymacx86 is a great resource tool and support tool) before deciding on my iMac, but it really came down to this: I don't want to be my own tech support. That's it. Nothing more melodramatic or complicated than that.
My initial headscratching moment was - after having read the reasons for why you bought an iMac in the first place, they had very little to do with the hardware itself, and it just came across that it had been a casual decision for you.