I was thinking the Leucs as well. The good thing about them is they get along in groups. I just got some Cobalt tints and they are very bold as well but you are limited to just a pair. I got the Cobalts over the Leucs simply because I like the yellow and blue colors. If I was going strictly on which would be the best first frogs i would have to go with the Leucs. Do some research on them. Your first experience with frogs should be with the most active and hardy frogs you can get. I have a group of red eyes and love them to death but they are strictly nocturnal frogs. There will be nothing going on in the daytime. Get a group Luecs and they'll be bouncing around all the time. Once your addicted to the frog hobby then branch out and try the tree frogs or other species that will give you different challenges. They all have something unique that makes them cool. But start off with the type of frogs that you really want. If its darts then find the boldest and easiest species to care for. That will make your first experience into frogs an enjoyable one.