Not really a PvPer with my MM. You don't say what you will be using as your travel power, other than SJ (assumed). Personally in my PvP build (done on the hero planner not in game) I took Fly/Hover (though I won't actually have fly till 41/44) plus Hasten/SS, Fitness pool (Hurdle, Health & Stamina) & Leadership (Assault/Tactics)
SS for speedy travel, I am Rob/Dark so also run Shadowfall for my Stealth. In PvP so far I have tried to remain inconspicuous, rather than relying on actual stealth powers. Afterall its my pets that are supposed to do the damage. Hover I use to remain near the pets but out of melee range. I did think about taking Concealment instead of Flight but I need a vertical travel power, so I'd have to drop hasten/SS which I'd rather not do.
Hover however does protect against knockback/down, and with three slots (flight speed) is not too slow for use while actually in combat.
I take Stamina quite late lvl28 I mainly need it for the lvl32 buff which eats end. 
Is stamina useful in PvP?
I'm going to respec my MM for PvP and I'm considering taking stamina. I don't currently have it and I've never really needed it in PvE. Only time I run out of endurance is in long AV fights, and for those I can just get a few cobs.
In PvP however I run out of endurance quite often, thanks to running assault, tactics, darkest night, SJ and acrobatics and using Petrifying Gaze quite a lot. Also I need to carry a full tray of Break Frees, so not much space for cobs. So I'm thinking of taking stamina, but still it doesn't seem a really necessary power for survivability, as I can always just run when low on endurance, or hope that my pets finish the job. Any thoughts?
Also I'm considering dropping acrobatics. I still have to have a full tray of BFs in case of any trolles (am I right in thinking that it doesn't really work against trollers?) and it seems perhaps a bit unnecessary?