Here is my Current spec a dps/pvp spec and a beginners spec for new guardians looking to start tanking.
Starter tanking spec.
http://aoc.yg.com/feat-planner?class...015-21,4013-21
I used this spec tell about 3 months ago its good for just strait tanking i dont really like juggernaut the ability but for undergeared new tanks it does help out the testing ive done showed me you dont get the +armor from juggernaut but the weapon damage,protection procs do work.
My Dps/Pvp Spec
http://aoc.yg.com/feat-planner?class...,255-11,242-11
I have only used this spec 2-3x its a fun spec but i feel dirty trying to dps on a tank especially considering how many dps conqs,dt's i have bitched out for being useless=D
My current spec for pvp and Pve.
http://aoc.yg.com/feat-planner?class...015-21,4013-21
I was having trouble holding agro with my old spec so i got rid of jugg intervene,strike and guard and put those extra points into tempest its more dps plus redoubt,improved dulling blow and wall of steel give me 15-20% evade 20-35 seconds of every minute which in the long run helps me survive longer then i did useing juggernaut.
Yes im missing some nice things here and there but this spec is the best balance between dps and survivabilty defiance is nice but if your healers and offtanks are doing there jobs then it is not needed tempest/gen is ok but u lose 2-3 ccs so i would not advise goin with that spec.