Has to be the original 900 soft top for me, for the authentic Swedish feel and insane heater! My parents had a full fat 900 turbo soft top (all of 175bhp from a turbo'd 2 litre!) which sounded awesome with an almost subara off beat exhaust note
everything rattled with the roof down but one of my most memorable drives ever was London to cheddar all on country roads in the middle of winter with the roof down! Had to stop and peel some layers off as was getting cooked lol
Very jealous of the roof mechanism on the newer version - much more theatre than the pram hood on our old one