If possible, I'd suggest going to a decent department store or similar outlet where they have cologne testers. Spray a few, and a few more, and then you get an idea of what you like.
At that point, you can
a) just buy the stuff, or
b) get samples of the stuff for lengthier tests, or
c) get decants of the stuff for lengthier-ier tests, or
d) ask your good buddies at B&B "what smells like XXXX but is better?" and then buy whatever Penhaligon's or Floris is most commonly suggested.
Be there or be square. Only I can do both!
I've got a cat named Beefeater and a dog named Beefeater, and two goldfish called Beefeater and Beefeater. There's Beefeater my hamster and Beefeater my horse, and my piglet, known as Beefeater of course.
Veteran of the Great Irisch Moos Campaign of 2008-09