SIMV, if a fitter is basing your clubs' specs on your physical measurements (height, wrist-to-ground, etc) just walk away before you waste your money.
Do what FindlayBucks did and get a DYNAMIC fitting. the thing that matters most is where your clubhead is at impact while you are actually hitting a golf shot.
I was a custom fitter for Henry Griffitts, and one of the first things i learned was how much your clubs affect your ability to learn and groove a good golf swing.
As far as length is concerned, the main factor is your skill level - your ability to hit the ball on the sweet spot. go with as long a club as you can effectively hit the sweet spot with. length also affects the effective lie angle, and is one of the way to adjust that spec. I, myself am only 5'9' and my clubs are 1" longer than standard.
As far as shaft flex goes - again, if the fitter is basing it solely on how far you hit the ball - walk away. the main factor there is how you load the shaft. For example, Jack Nicklaus hit the ball a mile, but his swing was more of a "gravity" swing as far as his change of direction and his first move down. his "loading" of the shaft was more gradual. So he only ever needed S300 shafts (your basic stiff flex). Lanny Wadkins, on the other hand, had a very fast tempo swing, and put alot of stress on the shaft during his change of direction from backswing to downswing, and his first move down, so he needed X-Stiff shafts. however, Nicklaus hit the ball WAY farther than Wadkins.
having said all that, also bear in mind that most guys out there are using clubs with too stiff of a shaft, and not enough loft on their drivers.
If you are serious about the game, get a dynamic fitting and get some clubs made to those specs (and don't let your ego get in the way)