Personally, I like the Brawler tree. It feels like a boxer - is that what you were going for? With a little tweaking, it would definitely be useable.
Pretty much, a boxer, or more specific, the fighter who reveals in the bar fight, or back alley tussel. I had a couple ideas for maybe benefits with grapple ideas, but couldn't settle on anything. Any suggestions for tweaking.
As for the dervish, name problems aside, if there are these other feats that give similar abilities, I might reconsider the whole tree. The couple ideas I did like where being able to 5ft step and move action, and possible spend Edge for an attack, though perhaps I can work in a few more conditions to make it not so spamable.