Coming from a 34' yes I can see some adjustment to the 27, although I know in my case I carry probably way too much gear
just because I have ample stowage compartments. If it was just for myself, 27' would be quite sufficent, i think??
Guess a lot depends on what your sailing intentions are at this stage of the game
and also your budget
availability of replacement parts
may come to mind regarding the BMW engine
and/or their cost. Are they even still in production, might not be an issue now but may come back to bite you?
Don't be too hasty
, there seems to be endless quality boats for sale
out there and one is sure to meet your needs.