For me it would be a 27-28' cat deck boat much like the DCB F30 powered by outboards. My differences only being the length and it would have a walk up swim step in the center of transom.
As for warranty and service, 2 year warranty and do first required maintenance free, then offer a preferred rate for future service or mechanical issues. Reason for 2 year warranty is because of seasonal boating, in other words most people only get a half years use in 1 year.