Best engine for sensible cash.

[andys]

I know nothing about engines, I've got a second hand Noverossi plus 4 .21 engine in my RC8B and it's run faultlessly so far (thanks Bally at MB )

I do though fancy a new one, just to learn a bit more and break it in / set it up myself.

Who make good engines, and which ones should I avoid ?
Will a new engine work ok with my Noverossi exhaust too ?

Cheers.