In my opinion, fiberglass is a bad idea, for you -- it encourages bad habits, because it's a LOT more tolerant of abuse.
That means that if your recovery kills are poor, the rocket doesn't force you to learn to solve your problems. Instead, it encourages you to continue on, and not worry about it.
Personally, I think you should be looking at cardboard -- built right, and flown right, they'll last a long time.
-Kevin
This is sound advice. Build a few LOC, PML, heck *cough* Estes MPR kits first. You'll learn the fundamentals of higher impulse. It will serve you well in the long run.