I use a GL Coyote on my DRZ and it fits pretty good on the Terra too. I find the Great Basin to be pretty big and bulky IMHO. With the Coyote, you still have some back rack left on the Husky for a second dry duffel (Ortlieb 31L for me). It's nice to be able to move luggage between bikes with no hardware. I'll try and figure out Pics on this site and post one for you.
As far as the mud slinging on the radiator, the high fender on my Terra protects it completely, so maybe a high fender would be good for the Strada. Plus, it looks pretty cool too!