Best Game Platform For Young Children?

[Drac]

The grandparents have offered to buy a video game platform for my kids. While I don't know that we'll even allow this to happen yet, I'm curious as to what system would be the best for a 6 year old. Obviously I'm looking at games like Pac Man or other non violent, kid oriented programs. I'd really like to get some help here as I'm completely clueless. I do all my gaming on a PC and don't know diddly squat about the XBox, PS2, etc. Thanks in advance for any direction you can provide.