| I have a 999 Mono and use the Ventura kit on it...sits quite high but works very well. Its about the only option for carrying sufficient quanties on a Mono.
As far as tank bags, I generally hate the things but having no under seat storage on the Duke, I use a Oxford Sprint bag which just about carries a camera and passport but is small and low. It has a map pocket.
As for Sat Nav, I have just got a Garmin Quest. Works on the bike with just setting it inside the map pocket. The battery has enough life for a 12-14 hour day before needing recharged. You can get helmet speakers etc, but I don't necessarily like them so just work off reading what the screen says. If you want voice prompt you need to wire it into the bike. I have not taken the bike to Italy yet but am just back after spending the weekend in Italy and the Sat Nav worked really well...got me to the factory, Imola, Masino and the beech at Rimini without any wrong turns ! | 
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