sprockets

On my kz900 i have a 16t front sprocket, with an 18 inch rear wheel.It has a 46t rear sprocket on it now, and that seems like its too much gear i also have a 38t sprocket which was alrite but i wanted a little more "off the line" my question is, what would be a good rear sprocket that would give me a good take off, but not rev to death on the freeway. thnx.

530 or 630 chain?

530. and the motor isnt stock either.

ok so what are you wanting it to do? i run a 16x40 530 on my 1327 with a 16" rear wheel,which im guessing isnt too much shorter than an average 18" wheel.
my tach/speedo dont work but im guessing it winds out around 120 or so but gets there pretty quickly

Well, its ridden daily. i wanted a set up that isnt too hard on the motor. like rite now with the 46t rear my fifth gear is like third gear, i can hit it in fifth and it takes off fast, which is fun, but when i back off or i am just buzzing around town in fifth it sounds like i need another gear. when im going slow and just putting around its not so bad, but i dont putt around much.