Do a search for these boats on the forum--you'll find extensive discussions and many answers to your questions.
Two comments:
1. Just because something is light weight does not mean it is not strong; it may just be well engineered and well made.
2. Rig and sail the three boats personally if at all possible--you'll learn more in 10 minutes sailing each boat than in 10 hours on the forum.
Excellent advice. There are a fair no of all 3 boats (I'm Wouter will be along in a minute) in NL.
