Regulators need periodic servicing. Unless you intend to do it yourself (in which case availability of parts varies with brand), you'll want one an area dive shop is willing to do servicing on (unless you're willing to mail it in for that).
Neoprene for wetsuits varies in quality of stretchiness. I've got a big head; I've got 2 2-XL hoods, what at least at the time was Henderson's premium material in an AquaLock hood, and their 'value' version in a Neosport hood. The former is tight on my jaw; the latter is tight on me period! Yes my properly sized Neosport 7 mm boots are fine. So, for neoprene products where fit matters, be away stretchiness can be a factor in comfort and, if you're buying a size marginal for you, fit.
A computer that can download data to a PC lets you 'auto-log' dives, which some people like to do. An air-integrated one can likely log start & end pressures, calculate your SAC and at least some can give estimated air time remaining (if you continue breathing at a constant rate & don't change depth; not perfect, but can be handy for some people).
An SMB is a good idea; hopefully you'll never be floating around at sea lost from the boat, but if you area, it can make you way easier to see and fine.
If you get a cutting tool, many people like the Trilobyte. I do, too. Fits in a thin pocket on my BCD front strap. Dive Gear Express sells a similar product with a rust proof blade, IIRC. I'd consider that. If you get a dive knife, tastes vary. I prefer rust proof (unlike your BCD D-rings, the stainless steel in dive knives often rusts fairly readily), and that means a titanium blade, or an H1 steel blade from Spyderco.
I've not dove a BP/W; hope to try someday. Where jacket BCDs are concerned, I'm chubby and weight belts didn't stay up on me well (I was even chubbier back then); I'm a fan of integrated weight BCDs (after all, you can wear a weight belt anyway if you want).
Richard.
