I have experienced that tanking specs are best for PvP but I haven't rolled a monk yet so I am not sure.
and once ur geared WW isnt garbage our 1v1 is unsurpassed other then a skilled geared Fmage, the class has a high skill cap which scares people and yes alot of the mechanincs are clinky but theres ALOT of WWs out there that are good and making it work, the ones that stick with it to 5.2 are in for a treat, its going to be an all you can #*##!@*! buffet
WW and MW are both viable. MW pales in comparison to other healers in an arena setting but shines in larger groups that don't need the help with cc, while WW is capable of all of PvP outside of RBG.