buy the tower, get used to a 40. landings, takeoff's ect are much much different compared to a small foamy (much longer) which takes a little getting used to.

then once you master the tower move everything (servo's engine ect) into another airframe (ugly stick, gp rapture, 4 star ect)

however i do not think you should fly a 40 in the neighboorhood, its just a accident waiting to happen. and unlike a foamy bigger planes can do much more damage.
get a club membership and have fun, its much more fun flying/talking with others.