Do you have your license yet? Have you completed the MSF course? Have you ever ridden a motorcycle whether it be a street or dirt bike? What type of riding will you be doing?
First off, complete the course offered by the Motorcycle Safety Foundation. You can find a local class online using google.
Secondly, go to your local motorcycle dealership and sit on some of the different motorcycles, sportbikes and cruisers.
Familiarize yourself with the different manufacturers and not just the 3 you listed. There are many more out there.
Save your money. Save your money. Save your money. Save your money. DO NOT FINANCE YOUR FIRST MOTORCYCLE. GET FULL COVERAGE. YOU'LL DROP IT.