"GET the .46 FX i learnd a lesson when i wanted a kaos i needed a bigger .46 and was stuk with the LA"

dont you mean a more powerfull 46? the 46 FX and LA are the same displacment.

The 46 LA and FX are both excellent motors but value for money i prefer the Thunder Tiger 46 or GMS 47, having said that the Avistar is probably suited to a smaller engine so i'd go with the Thunder tiger 42