Positives of headless? Well as said above, they never go out of tune. They have a straight string pull so no chance of strings slipping on the tuning post. Strings are a doddle to change. With double ball strings you just loosen the tuner slot the string out, slot another in and tune up. I'm naturally going to suggest Status if you can afford one. You won't find any headless Statii with wooden necks though. If you solo the front pickup you get a pretty good Pbass sound.
I have a Hohner B2A as well. Everyone always slags off the EMG Select pups but I get a fine sound from mine. Might be best to go the cheaper route first and see how you get on.