Yo! I would like to learn butter slides and want to know whats a sweet board to bust these on 
I would imagine finless twintips would be easiest to do this with and have seen that the Cabrihna Custom can go finless quite well, but i would like to steer clear of such names as Cabrihna, Naish, and North as simply coz i would assume there is added $$$ just for the name sake, plus i know there are sick brands out there.
Also, I have a 2011 Nobile 50fifty, anyone ridden these finless yet? I would assume it would be ok as finless tt, but i wouldnt mind feeding my addiction and add another board to my quiver. 
You can learn to do them with fins. Just a case of breaking out the fins and getting the board to slide.
Tona POP works so well without fins I took mine off to try it and never put them back.
I've only tried to butterknife with a (very) small board that I knocked up when making a 'normal' sized board.
It is only 900mm long and finless. Very 'loose' to ride but this makes it easier to swivel onto its end.
Not sure if this helps at all?
Good luck & have fun 
a more powerful pulling kite makes these an easy trick ive been doing them on a shinn monk with finns , id say the trick would be easier without finns, dropping my hand off the bar has emphasised the trick
