tough question to answer.

I have two of the raptor 50's great performance and low maintinence. works for me. the upgrade is expensive though, might be best to sell the 30 and start with a new 50 kit.

I have bought a frea 90 recently, haven't flown it, but from what i see and hear of freinds who have one it seems noticabley more stable, and seems to flip in kinda slow motion compared to the 50 so it seems like it will be easier to fly.... sorry, i can't offer a definitive answer, except to say if you think you need more power, you are right, and you would probably love any of the helis you are thinking of.