Well I dont' ride open pros per say but I do have a set of Mavic Cosmos wheels which use a rim that I think is the same as the OP (or pretty darn near it). I had a great set of DT Swiss RR1.1 rims laced to Speedcific hubs for a while and love my Sun M19A-II rims which have a slight aero shape but are pretty much a box section rim like the OP.

32 spokes only makes sense...you can get away with 28 up front and the only reason I am running the Cosmos which are a bit lower spoke count is that I got them for $200 shipped...beater wheel for sure.

My Marin uses Salsa DelgadoX rims which are box section but a bit wider than OPs...they are a cyclocross rim.