That's one of the things I keep telling my self. Going from my current Nighthawk to the Ninja 300 I would drop almost 60lbs of weight. Even from a modern SV650 it would be over 40lbs. In my ideal world I would have a 300 and a supersport. One for just cruising around and one for when I want to got FAST. I can't have 2 bikes so getting an SV650 is a good middle ground and most likely where I will end up.
Nothing wrong with an SV650. I actually missed my FZ6 a bit when I went to the R1. First gear would do 160 km/h on the R1 so I could never wring it's neck without breaking every law in Ontario. Planned a few track days but never got out (except the 1/4 mile a few times)...
After this thread I started looking into used FZR400s and I could get one for about $2500-3000 and insure it for $350 a year. Not a bad idear!