Another vote for looking at Vintage Double Hose vs Halcyon for BP/W. The VDH 35lb wing is extremely compact and has built in roll stability for tank eliminating need for a STA. I have with AL backplate and recently took on trip to Turks and Caicos, packed two peoples worth of dive gear in a single bag, 45 lbs. add a couple of inexpensive ditchable and trim weight pockets and you will have enough weight and lift capacity for cold water diving as well.