Wow, there's a lot to answer in that post.

I think if you don't want incredible speed, the 2000KV medusa on 4s will probably be a good starting point for you. 5s can get very fast, very quick. 4s is nothing to scoff at. Granted, there's a benefit to going with higher voltage, as the whole system will be more efficient, and you're likely to see better runtimes.

My 9xl Revo is very fast on 4s, and it's much easier to keep the temps down than it is with the 8xl. It will still wheelie like mad. You can tune it modestly to keep help keep it under control, as you said you weren't into that (yet, LOL).

I'd say the MMM should run any of the setups you posted without a problem. So your ESC choice is (hopefully) good.

Batteries..... hrm. lol.

looking at c ratings:

The c rate of a given battery cell, is a measurement of how quickly a battery can discharge its usable capacity. Without over complicating things, we can use a simple formula to determine what sort of constant amp draw a pack can deliver by using it's c rate.

multiply the c rate by the capacity and you will see the amp draw capability of the pack. The true RC pack for example.

10 x 8000 = 80,000.

Now remember, we're talking mA here, so 80,000mA = 80A. So we can see, the truerc 10c 8000mAh pack should deliver 80A constant. When selecting your pack, you must consider what the amperage demands of your setup will be, according to motor / voltage selection.

I'm sure you will have further questions ;). Good luck with your build! I think you've selected an excellent platform to jump in on. A big part of your choices will depend on budget, so it's good to have an idea of what you'd be willing to spend for a solid setup.

Oh yeah, and welcome to the forums! Lot's of great folks around here!
J>