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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.
Sena are not as good as people are making out. I have had 3 20S units fail on me and they are only splash proof NOT water proof. Check out the Sena forums , I'm not the only one !!
Having had enough of Sena I have bought Interphone Tour's and couldn't be happier.