what kind of BC system you will like until you dive the different ones.
If you're buying gear, I think you absolutely should try a BP+Wing, a back inflate (e.g. Scubapro Knighthawk) and a "conventional" jacket BC (Seaquest, etc) before you buy ANY BC.
Yes, try all THREE.
If your LDS won't or doesn't support all three, find one that does or find someone who has the gear and will let you try them on a real dive.
I did, I have, and the BP+Wing is what I prefer.
Today, I dive singles with it.
I STILL prefer it, because I can take most of my weight off my belt, it is FAR easier to trim myself properly with it, and I find it a far more secure and comfortable fit underwater.
YOU may not prefer it though - but you will never know unless you try.