[Finnster]

First of I would say any project building a BL is going to be expensive bc the maxx is inherently a weak platform to build on, hence the multitude of upgrades "needed" and available in the marketplace. Its not the worst, ad still a great truck when finished, but you can get better for easier and cheaper.

Personally I dumped my maxx and converted a Revo and have not looked back. My maxx seemed like a constant frustration even with brushed motors and tons of upgrades. The Revo stock is a tougher and lighter truck from the beginning. Just for example, the revo has a full length 3mm alu chassis that is one solid piece, as opposed to the maxx that has weak connections between the chassis "dogears' to bulks to skidplat to chassis braces back to chassis. All the force of a front end crash goes into the bulks and the 3mm screws that tie them into the rest of the chassis. If the bulks don't break, all that force goes into lateral force that often shears the screws. If you now have alu bulks, you are left with bent, stripped and or sheared off screw holes. I could go on, but you know what i mean.

Brushless power is that good. Watch some vids if your not convinced. I will never run a brushed motor again.

If your married to 12 cells (even 14) you could go with a Felag/Bk wanderer 7xl or a 8xl for 12-16 cells. I have a 8xl on 14 and its very powerful. I also run a mamba max esc w/ a ubec and really like it. it has a 100A capability, so the 7xl might be a bit hot for it, but the 8xl draws around 85-90A, so its fine. The MM system is a 1/10 system, so the motors themselves are too small for a MT, the esc itself is a powerhouse tho.

The Quark 125 can handle upto 18 cells and 125A if you are thinking of going higher power than that later, but its nearly twice the price so... choose carefully if you are on a budget.

As far as ubecs go, theres not to much to it. Find one that matches the specs you need.