Howdy, I was also interested. This would be my first PbP, though I played D&D off and on for the last couple decades, and recently got into DW in a big way, playing in a roll20/hangouts game, and DM-ing a couple F2F.
In my other game, I'm rolling Wizard (vanilla, yeah, trying it out... not impressed even at lvl 4-5.), so I'll be looking at anything else, and don't mind an excuse to buy playbooks if anyone can personally recommend them from actual play experience. Sarcasm is hard to detect in text, let alone w/ someone new... so a quick search on "Slayer" ( https://www.reddit.com/r/DungeonWorld/comments/54tadk/thoughts_on_the_slaye r_playbook/ ), after just the few bullet points makes me go "nope"... not DW, next... so I hope it was sarcasm, but if we just have a difference of opinion, that's ok too.