I like that people mentioned Feral, I played feral briefly in TBC and adored it - haven't played it since though, but now I'm tempted to get my rdruid a feral set
The only melee I'm playing at 90 currently is my unholy dk, which is fun at times but feels too much like a support spec at others - lots of damage, lots of pressure and control and survivability - but no real burst to get excited about.
The next melee I plan to get to 90 though is my Enhancement shaman, I think they are flying under the radar for pvp right now - and the buffs coming to them are going to make them awesome