My progression:
SSI Open Water
NAUI Nitrox
SSI Advanced
SSI Rescue
SSI Master Diver
At this point I was interested in moving toward tec. My Interests were caves and wrecks. I enjoyed working with new divers but didn't want to go any further with SSI, I didn't like the local shop.
Two of my mentors (thousands of miles apart,they don't know each other) both suggested that I become an Instructor. The knowledge and the experience would help with my technical training. Also $ from teaching, DMing etc, and better deals from working with a shop would help with the equipment needed for technical diving.
I've always thought that if you hear the same thing from more than one source maybe you should take a look at it!
I became a NAUI Instructor Spring of 2003
I'm currently taking NAUI Advanced Nitrox, Deco Proceedures and Helitrox.
I may go to Florida in January (if funds permit) for Cavern, Intro, and Full Cave (the skills will help me to be a better wreck diver).
I plan on taking Trimix next year (after a bunch more Helitrox dives), and hope to eventually become a tec Instructor.
Since I started diving I've always went to "what's next". Not as card collecting, but as learning more and more! When I stop learning it's time to hang up my fins.