Don't Need Much
As far as how much of a bike a person needs for touring I would say about 110 cc should do it. Just ask nathanthepostman http://www.advrider.com/forums/showthread.php?t=460631
I have a GL1800 and it's a nice bike and GS1150 that is a nice bike too but I have more fun on my KLR650 and always had a grin on a little CB250 I use to have that I wish I still had. I am a fix'n to get a 200-250 size dual sport went I sell that GS. I would need the space and money from the GS.
Far better it is to dare mighty things, to win glorious triumphs even though
checked by failure, than to rank with those poor spirits who neither enjoy
nor suffer much because they live in the gray twilight that knows neither
victory nor defeat. ------Theodore Roosevelt.