A buddy of mine just bought that combo and I test-flew it for him. It's a nice package. Personally, I'd rather have a slightly stronger engine (like a Thunder Tiger .40 or .46 Pro) but you really don't need it.

Enjoy the Avistar for the great-flying airplane that it is and save the upgrade money for later when you decide what airplane, engines and equipment you'd like to have next.

Good flying,
desmobob