i have run a km 90 110 and a 130 with lots of atachments would not go any other route if i had to start over. for the first machine i would go a 110 it will take a bit to get the feel for the triger. Valve ajustments are a must only take like 5-10 min at most and will give you more power.
have not had too much luck with echo
have not had too much luck with echo