You didn't say whether you wanted this character for PvP or PvE - I get the feeling it's PvP since you mentioned playing monk in PvE (but still ask about it).
I know squat about PvP - but in case it's PvE you want:
You should already know that a healer/prot monk in PvE is very "busy". You spend all your time monitoring health and energy bars and clicking on things - no time to enjoy the scenery.

However, if you are doing PvE H&H, a Smiting Monk can be fun, and better at directing the group (targeting etc.). And yes, to all those who will jump on that, I realize that a Smiting Monk is not as powerful as other damage dealers, blah, blah, blah. Some of us are here to have fun, not blast through the game as fast as possible. (In fact, a Smiting Monk sucks as a damage dealer, so be sure to have good Heroes with you.)
Mesmer (in PvE) is a lot more fun to play than Monk. Mesmers do more than just interrupt. Like many classes, they can do various things, interrupt, degen, damage.