If you like a challenge you'll be hooked.

I don't personally have na Epsilon 90, I flew an Exelleron 90 last year and they seem to about the same dimensions. I would suggest a littel more power in the nose than a 91FX. If you can find a YS 1.10 that would be a good choice. I know some guys have used the ST2300 and the OS 1.20AX with great results.

The YS will allow you to put the fuel tank on the CG.