BIGGER IS BETTER. There is a reason why this is the slogan of the IMAA, the Intrnational Miniature Aircraft Association. Although a plank association, the slogan is correct for helicopters too.
So, if you want to spend money on a mini, is up to you. If you are tired of the mini and want to graduate into a larger heli, go ahead and give it a try. You will never look back, (unless you are a masochist like some of us that still mess with TRex 450 and similar helis)
I own a Trex 450XL, A Raptor 50, a Raptor 90, and a Bergen Gasser. Guess which one flies the most? Actually that was a trick question as there are two that I fly more than the other two.
Rafael