Just joined this forum as a future owner of a Promaster. Trying to decide between a high roof vs pop top at the moment. Figuring out layout too for an everyday driver / adventure vehicle. Narrowed down to a Promaster for sure though.
Two reasons for pop-top: sleeping >2 or mandatory storage under a low roof. Before committing, there is a thread on Sprinter-source.com discussing the two major pop-top suppliers. After reading it, I was very glad I didn't need one.
I looked at pop ups as I have owned several Westy VW pop ups over the decades. Too much money now a days for me. I happily got my 14 HT gasser 2 1/2 years ago. Love it. Love the head room. I could care less if it keeps me outs of drive thru's and parking garages!