That being said, whats a typical wing size for single AL tank diving in a say a 3mm shorty or 5mm max wet suit?
I would just use the "40lb" halcyon wing I already have (I don't think it actually has 40lbs of lift). Its not as a big a deal to have a modestly oversized wing as long as its still meant for single tanks.
If I were buying special for this application the Torus 17 or 26 from DSS would be high on my list of choices.