I need some help with Leapster. I am so confused. We want to get one for our son who is 3 1/2. I see there is a Leapster, Leapster2, L-max, and now the Explorer. Do you have one of these systems? Do you like one system over another? What is the difference between them? Do you recommend another system? I would love to hear what you think, my husband and I are so confused.

Thank you for your help in advance.
Lisa