I've got an Interphone F2, which is for a solo rider, similar to Lenny's Scala
http://www.interphoneuk.com/F2.php
It's got bluetooth, so it'll pair with sat nav & phone, cutting out the sat nav when you get a call.
I bought one of them little in ear hands free bluetooth devices, but it couldn't pair with the satnav, so beware.
Wind cancelling mic to talk as you ride, plus stereo headphones. One of which you can unplug so you could plug in a noise cancelling earphone.
Also has a spare 3.5mm input jack for an Mp3 player, as my TomTom rider didn't have a built in Mp3 player which my Garmin Zumo did