The Great Planes C-5 is a good choice for the TM. It's only $19.99 at Tower Hobbies:
The Great Planes C-10 ESC is also a good choice for the Beaver models. It is also only $24.99 at Tower Hobbies:
If you don't mind spending the money the Pixie 7P is a better controller than the C-5 but it's $34.95. The Pixie 20P is $39.95.
The C-10 is actually rated at 12 amps continuous so it's good up to 8 cell Speed 400 use.
I'd replace the JST battery and motor connections for Speed 300 and above use. Micro Deans connectors are a good choice.