For me personally, I would like to wait until I've sat in the East. That way I can put my focus on the Blue Lodge as I'm coming up. Once it's time for other brethren to pursue their call to leadership I'll move on to an appendant body.
I feel like a lot was lost on me when I was in a huge rush to get raised. I also feel like I was too young to appreciate many of the lessons as a 21 year old college student. 10 years later and I'm taking my time and really focusing on the ritual and the lectures, this time as part of our degree team.
I understand the thirst for further light. And I know it sure looks good on paper when you're 32nd Degree, part of the commandery, and ride a go kart in all the parades at 25 years old. (Not that there's anything wrong with that.) But I'm a Mason for life. I'm in it for the long-haul. I'm taking my time doing a very thorough search for light before I move on. I'm in no hurry.
I'm certainly not trying to discourage you from moving on to the appendant bodies quickly. I know several brothers who have, and who got a lot out of it. I would just like to mention there is still much to be learned in the Blue Lodge that you might miss if you move on too soon.