I own the Scubapro Knighthawk, and I really like it. It's a back floatation, so while you are bobbing up and down on the surface, you will be pushed forward, face down - which can be annoying. But, I don't spend that much time on the surface, so it doesn't really bother me.
I do work closely on coral under water, so I like that it is relatively free of "stuff" on the front side, allowing me to get close without raking the coral with my BC.
There are four air dumps, so whether I am horizontal, up or head down, I can easily dump air without having to alter my body position - a REAL must for me if I am doing fine, intricate work and don't want to reposition. It's also fairly light, which makes for nice travel - not THE lightest on the market, but light enough.
I also have the Air 2 installed, which is nice for getting rid of the extra hose.
Get it serviced once a year, and you gotta love the lifetime warranty...
If your local dive shop allows it, I suggest demoing several different types in the pool, so you can find which is best for you.
Cheers
Mike