Ok, here goes, my fantasy world choices:
Standard
Not sure what type of bike I would pick in this category, so I’ll go with a Harley XR1200.
Sport
Ducati Desmosedici RR. Or an Aprilia RSV4.
Streetfighter/Naked Sport
Ducati Monster 1100S. Or BMW K1300R. Or KTM 990 Superduke.
Touring
I think I would be more interested in sports touring, so perhaps Honda’s upcoming V4-engined (VFR 1200?) sports tourer, or a BMW K1300S. I could probably also lump KTM’s 990 SMT (Supermoto Touring) in this category.
Cruisers
Not really interested in this genre, but if I had to make a pick in this category it would definitely have to be a Harley Davidson Sportster. The Sportster really is more of a classic “standard” bike to me, so I don’t know if it even fits in this category.
Adventure
The BMW R1200GS would surely figure in here, but I’d also give the Moto Morini Gran Passo a look.
Supermotard
KTM 990 Supermoto.