the choices listed above are all good - wilson makes an excellent antenna (the 1000/5000 series are quite popular among the hardcore users here). i don't really have any experience with the wilson fiberglass antennas, though.
used a couple of firestik antennas with good results, but sort of moved on to skipshooters (also fiberglass antennas) and the good ol' 102" whip.
if you have $$$ burning a hole in your pocket, expect to run excessive (way above legal) amounts of power, you may want to consider something like a predator or monkey made open coil antenna. big, bulky, heavy, and very conspicuous - but they handle ridiculous amounts of power and get the job done.