Fungo - I think you're correct on the summer leagues. The league Michael is playing in is just that - full of JUCO kids and thus will have more exposure to college coaches.
Base4 - My own JUCO son is in the process of transferring this summer to a 4 year. I strongly recommend that you contact previous coaches/scouts you/player had relationships with. Their words and opinions mean alot more than a parent calling a coach.