i went from:
inline4 600 (100hp),
triple 955 (150hp) that was heavier but a bit more top heavy,
500 twin (46hp) weighs less though not as much as ud hope for but was quite well balanced with a great spread of torque from nowhere up to the red line that made it really nice on the roads to that makes a 4cyl 1000 jealous.
inline4 again but a 650 (80ish hp) that by specs doesnt seem to weigh greatly more but definitely is and more topside but nowhere near as the 955 was, slower than the 500 unless you want to ride it in the 10-14k rev range all the time.
i much prefer the twin and triple characters tbh.
mid capacity bike will do. twins for more fun below 70, triples for allround and slightly upper speeds, and inline fours for scream if you wanna go faster or to jail is my opinion.