I sold my18 and replaced it with a 21SE this winter and the difference is night and day, I owned the 18 for 6 years and really liked the boat but the 21 with an F200 is sooooo much nicer.
Ive been going back and forth a bit between the two myself. Took the 21SE out for a test run last week and loved it... Really like the new console in the 21 as well