Want a line that is sensitive almost like fluorocarbon but i also want to be able to fish big topwater on the same rod. So pretty much most sensitive floating line that you can buy. What line would you spool up with?

15lb Power Pro.  Its a braid so its very sensitive, and cause its braid it floats.  If your not into braid, I would say Trilene Sensation in 14lb.  very sensative copoly, and kinda floats, kinda don't.