I've been thinking of getting another Ducati since, well, I sold my Monster earlier this year really. The wife has given the green light so now I have to choose which one

I used to have a Monster 620ie Dark from 2002 until March this year and loved it, was my first proper bike after a little Peugeot Scooter

I had been considering an ST for quite some time, pretty much before I got the Monster but the engine size put me off. I've read through the forums here and reviews at other places and they all mention that the ST3 is heavier on the wrists than the Multi, some say even more than the Monster. Also, the riding position on the Multi is supposed to be better than the ST3. But, the ST3 and Monster's pretty much share the same frame and layout (as far as I know) so i think I should feel almost at home on the ST3 (standing by to be corrected!)
I'll be riding the bike to and from work, 20-30 mins each way, part Motorway part country lanes, and at the weekends I'll be riding home, I work in London and live on the south coast, a ride of about 2 hours; 1hr on Motorway and 1hr twisty A roads. I found the Monster a pain in the neck (literally) at decent Motorway speeds so would like something more comfortable, hence the thought of the ST3 and it's full fairing.
There will be some 2-up riding, mainly at weekends and rear seat comfort is a main factor for the better half, especially after going on the back of the Monster's tiny seat (she wasn't happy with that experience!)
So, i guess in short; is the Multi good at Motorway speeds (70mph+)?, is it ok 2 up without the pillion either hugging you or looking like a Meerkat? Is it ok with luggage, panniers or top box? Should I buy brand new or 2nd hand, what about ex-demo?
questions questions questions......
Any help/advice would be really appreciated
Thanks!
Jon Clements