When I was at your stage, I complained to my mentor that I needed to have a "better" plane than my .46 powered Kadet LT40. He took the transmitter out of my hands and proceded to do rolling circles to the right to the left rolling in and rolling out. He handed the transmitter back and said "Aint the plane."
Getting a "sportier" plane than a trainer will make learning aerobatics easier. Doing aerobatics well with a trainer will make you a much better pilot.
The SWITCH in the mid wing position is an EXCELLENT pattern trainer it will fly for 11 minutes and it will knife edge. It has only two drawbacks, the landing gear is sort of flimsy and bends easily, the supertiger lipo's are heavy for what you get. I've replaced mine with the batts used in the parkzone T-28. Saves a couple of ounces and the perfomance goes up a bit.
I'd go with your original plan and start with the high wing switch then switch. Be prepared to add a LOT of down trim when you reconfigure to the mid wing set up.
MTC YMMV
Tom been flying a switch for over a year now.
http://www.rcgroups.com/forums/showt...1313507&page=5