[glassdoctor]

Long story short, here's my suggestions:

ESC options:
Mamba Max (water resistant)
Mtroniks Truck (100% waterproof)
Quark 125b (not waterproofed.. may need some modding to run cool)

Motor options:
Neu 1515 1Y (might have a little cogging on the Mamba right now...)
Lehner 1940 8t (Nice... but does have odd size 4mm shaft)
Plettenberg Big Maxximum (Very good motor but expensive)
Cheap: Feigao 9XL

Basicly any combination of the above choices will work fine... and there are more choices too, like the MGM escs.

ESCs have built in BECs, but normally you should bypass it and use a separate BEC device. Very simple... just unplug the red wire on the rx plug.

You don't need to use mechanical brakes... but if you must, then Mike's motor mounts allow you to do that. You will have to find a spot to mount the brake servo and linkages. The stock radio tray is always modified or removed with a brushless conversion.

Batteries: For runtime... I like the 8000mah for a truggy. You can use a single pack (4s4p) or two packs (2s2p) hooked together in series... doesn't matter.

Your charger looks fine to me. Up to 5s lipo. Max charge rate is 5 amps so the 8000 will take a little longer to charge than a charger than can do higher.