If I had it to do over again I would have gone straight for the BP/Wings. Get a wing for single tank diving for now. Later you can upgrade to a larger wing with more lift. Before I really researched them (and purchased the rig) they were a bit of a mystery for me because I assumed too much about the setup. The fact is they are very simple, very streamlined, very ridged, less likely to ever have a tank slip, simple to use, and upgradeable into any level of diving you may wish to pursue.
I just bought a Dive Rite stainless steel BP, wing with 59#'s of lift, Highland Mills tank bands, and Dive Rite 300 bar manifold with isolator for $540 US. This is about $100 more than what I paid for my Seaquest BC that I no longer have use for. (I will use it for single tank dives since I already have it).
--Matt