A Hobbistar 60 or Tower 60 would be OK for your.75. I have seen a Nexstar converted to a .60 & it was very impressive.

As for the Corsair as a second plane -- only if if you didn't like it much -- you wouldn't have it very long.

Serafim -- you certainly can have too much power -- put that 75 into an LT-40 & watch the results -- despite the LT-40's generous size, it would probably lose its wings in level flight at full throttle.