It's gonna be nice to know of another semi-local electric Z-Car
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However, those Hobby City motors are crap, they aren't even worth the time spent looking at them. A good motor is going to be totally worth it, and the Medusa motors are perfect on a budget. Only about $115:
http://www.rc-monster.com/proddetail...usa3660&cat=20
I'd go with the 2000kv version as it is well suited to this buggy. Mine is running a Neu 1512 2000kv, and unfortunately the smallest pinion I can use is an 18t because the motor hits the rear brace. The Medusa is smaller in diameter and thus will allow a broader range of gearing options. If you paired the Medusa 36-60-2000 with a 16t pinion you should have an awesome buggy!
As for the MM, it will work but is likely to require a fan. The MMM also will run the Medusa motor A LOT smoother and I would totally recommend it. Besides, I know how much the MMM will cost you when they get to your store, and they're pretty cheap
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Another option is to just wait for the MMM combo with the 1512-size motor (2650 kv). My only concern with this option is that you won't be able to gear it properly. It would require about a 14t pinion which I don't think would fit with the stock spur and rear brace, without any modifications.