man there are so many magazine reviews of this exact question right now on the newsstands I would go read up and see what some of the opinions are.

ZX-10 was a big hit, but have proven to have a couple small problems that hurt their reputation.

GSXR 1000 supposedly a great bike, and you see them everywhere you go - makes me wonder how much the financing options and "gixxer" following impact their sales more than superiority over other bikes.

CBR 1000 - never heard anything bad about them, definately has the reliability factor being a honda.

R1, what can I say - they have been a top contender for a while now, and are seriously making up ground against the GSXR's in the way of popularity.