The vast majority of my dives are shallow 30' or less shore dives. This is because the closest sites to our house are that depth. As well, my own personal rule is I don't dive solo (much) deeper than 30'--I don't have a regular buddy (or one at all, really), as this involves a 150 mile round trip to places the buddy would want to dive--and at Canadian gas prices.... But, I will dive to the recreational limit or well above it on the odd charter I take. This is based on 1) CAN I find a boat to go out in winter in NW Florida? 2)They'll go where they go and it is usually a planned trip, not my choice and most importantly 3) Do they allow shell collecting, which is my only objective regardless of depth (as pointed out, you should always need a reason to go deep). So that is why I would wind up at 120-130 feet. Given a choice, I would prefer shallower dives with longer NDLs, as the OP suggested.