Welcome to off road! Great fun, I'll be really surprised if you don't love it! Jumps, surface changes etc all mega, and the B5m a good car out of the box, strong as hell too.
I've not raced 1/12th; haven't set a turning circle on a buggy before personally?
Re the TX/RX, loads of people at our club have cheap stuff when they start out, and the younger members (kids!) crash so much while they're learning I'm not sure a Sanwa would make any difference. Personally I'd go cheap at first and see if he likes it, plus no worries if he drops it. (no idea how old is of course!)
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