A little off topic here, but what makes you think you are allergic to nitro (or was that a tongue-in-cheek statement)? Because if it's the noxious headache-inducing smell, mess of oil/dirt mud coating everything resulting from running in any kind of dirt, annoying mosquito-like drone, or just the frustration and headache from continually tuning for weather conditions (not to mention trying to get it started and keep running), then I think we are all qualified to say we are allergic to nitro too!
Anyway, I agree with the Slash, Rustler, Stampede ideas; they are tough, lightweight, easy to fix, run great, parts availability is usually common, and require less battery (a single 2s or 3s pack is perfect).