Daniel,

If you are even thinking of 3S on the 350, stay away from the C box!!! the D box is fine! With the 2S pack, the 12x6 is REALLY nice!!! The 11x4.7 is a very close second best! With the 3S you want to go with the 10x4.7!

The best thing would be to buy one of each 10x4.7 11x4.7 12x6 an try them all!

Just my thoughts,

Reg