Electric or nitro is your totally up to you. We've covered this topic enough to know they both have plus' and minus'. I don't think a 50 nitro is very loud compared to a 50 electric so sound isn't really a issue. As for size, bigger flys better but does cost more. Align makes great helis and is a very good choice for a 450 elec, 50 elec, or 50 nitro. You sound like you are into this heli thing so pick one and I bet within a year you will have all 3!