Nivo Im with HH. I would stay away from the P version due to maint costs.
How often would you be flying it? Commercial or Private?
Private I suspect. If you are not flying alot a B58 can be a handfull and Press. is just another system to trip you up. To put it in contest for you I dont' see much of an advantage in a pressuriised however I have never flown one.
I have however flown one that I think you may know of(non press.). A B55 at the big castle, in the days of homer. If you really want short field Baron one similar to that would be the go for you as you have an approved short field configuration so if things do go wrong you are covered in legal terms. I would have to ask you though do you really want to be operating out of short strips in a high performance ac like that? You also probably know that the 55 will reduce your payload.
Happy searching