I have a BMW R1150GS as my second bike - i've had it since 03,travelled over 40K miles on it and visited loads of countries in Europe on it.
I used to tour on it everywhere but now i'm considering chopping for a Fat Boy or otherwise. I'm still not sure. It's nice to have a 2nd bike to compare my Ultra to.
Next to my Dyna there is a 1978 Honda CB400A (automatic). Bright yellow, its not technically my "2nd" bike, its my wife's, but i like putting around on it once in a while.
If I had a 2nd bike it would have to be a BMW GS adventure! 3rd bike would have to be
A 2010 Yamaha Star VMAX! (we all deserve 190 horsepower between our legs!)