A little late to the party here, but I'd like to make a request
If you decide to switch, before you do get some numbers. Just game or run tests like you normally would, with tabs open and youtube or whatever on the second screen and the game on the other. It would be really interesting to see a real life person with real world usage bench an off the shelf r7 against an i7. Frametimes, fps, valley scores, whatever works. That could help confirm working theory that the r7 is the "better" chip for multitasking and a lot of enthusiast real world use.
Also, in regard to the cooler I'm fairly certain you could get an upgrade kit for the noctua either for free or a small amount of cash, noctua is pretty cool about all that.
I'll say this, i went with a 8350 over a 2500k when i built my rig, and in a lot of ways i regret that decision, specifically because of gaming. But that old chip still manages to keep up incredibly well, and even though it might lose out in gaming its a real gem for things like virtualization and rendering video, etc., which has actually really paid off for me a number of times. Either way you're going to have a good processor, so I wouldn't sweat it too much man!
Also, bear in mind that the AM4 socket is going to be supported through 2020 at least. So you'll get a much longer life out of your motherboard and have a longer potential upgrade path than with the 7700k.
Forgot to mention that