Looking for the best board for a remote controller/networked controlled robot

It draws power from the batteries through the Arduino board right?

Wrong! You should first strudy the servos that the commercial vendors include in their hexapod kits to see what works. May save you some $$$ and fustration in the long run.

https://www.google.com/search?hl=en&as_q=hexapod+kit&as_epq=&as_oq=&as_eq=&as_nlo=&as_nhi=&lr=&cr=&as_qdr=all&as_sitesearch=&as_occt=any&safe=off&tbs=&as_filetype=&as_rights=