I'd go to headsuprc.com and look at the Powerup 15. Esc's a pretty cheap. I use the HURC's or the Turnigy Plush series from HK. Nice thing about Headsup is that they ship fast and normally only charge $2.00. Great service with these guys. Jeff can help you with the motor mount compatibility. I know when I replaced my parkzone motor with the emax 2820/07 it was a direct fit.
The world is your oyster when it comes to selecting BL motors. The other considerations besides KV & wattage would be size and weight. Will it fit? The way I look at it is if your adding weight that is useful weight, like more thrust,etc. That's not a bad thing. Dead weight or having to add ballast to compensate for CG is not a good thing.