I wouldn't do dual receivers. I'd use a redundant battery system though. Some say this isn't necessary either, but I do it on anything 1.20/25% and bigger. I figure even spending $60 extra bucks on a Li-ion, regulator, and switch is worth it for an airplane that cost me over $1000. Of course, you could bring it down to somewhere around $30-35 depending on what you buy. I just like lithium ions but I also like NiMH.