For the money you can't beat the Magnum 2 stroke .91 for $150. I am running a 15x4W APC on mine and with about a gallon through it , it peaks at 10,900 on 10% fuel with the stock muffler/no baffle.

The first tank peaked at 9,700 and it keeps getting better.

The Saito 100 won't beat those numbers but some people just love the 4-strokes. I prefer the 2 strokes, both will do the job.

If you go the 4 stroke route, get the 100 not a .91