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I would go Sena if you ride with her on the back a lot..
Maybe get a cheap pair before you decide whether or not you like them, as the sena units are the best but a lot more expensive.
I've use Sena for about 4 years now and it's been excellent. The latest ones will connect to other brands too, whereas some are proprietary. iPhone integration is really useful, as you're essentially just using Siri, so have access to everything that Siri can do (directions, read out and reply to texts, dial contacts etc)
That's what I want too, and a Shoei GT-Air to go with it
All I would say is make sure there's enough room on your left grip area for the remote, if you have big hands/short grips it might get a little tight.