What P.C. size would you say is proper for wingsuit BASE jumping?

I figure that due to the increased burble caused by the suit, you'd definitely want to go with ZP rather than F-111 to prevent any hesitations. I'm kinda baffled as to what size would be appropriate for the airspeed...

The smallest ZP with a handle that BR makes is a 38 inch. Is that the best option or do you recommend larger? What size do you use?