Hmmm, don't know about the MUS but it seems that you could get an E-Starter AND a Formosa (or a foamy warbird) for the same price. The E-S is a proven aileron trainer and with extra power and increased rates it could be made a bit more sporty. The Formosa is a good low-wing-trainer / aerobatic plane. You can transfer equipment from the one to the other.

These are not the only options but I have experience with E-Starter and Formosa.