When I started to collect, I had the same problem. Worse, because I liked all kinds: old German swirls (what I started with), micas, chinas and clays, handgathered, vintage machine mades, Jabo special runs, handmade contemporary. Awful. I finally settled on two restrictions (I had to impose some.) One was the same as chicagocyclist - just the pretty ones that I loved - the other was size. I decided I wouldn`t buy anything that couldn`t be used in play - marbles, no orbs, globes, those huge German oldies, huge contemporaries, etc. Nothing bigger than 1 1/16" The contemporaries were particularly hard; so many artists rarely worked that small. Took me four years to get 4 James Alloway marbles. But I had to stop somewhere!