Hi - I think it's time to buy some new toys for my 17-month old son, but I have no idea what to get! We spend a lot of time outside, but now that the weather is getting crappy I realize that he's outgrown most of his toys in the house. Any ideas? I'd love some input. His favorite game since he was 7 months old has been cup stacking, but I think it's getting old. Is there anything similar but a bit more advanced on the market? My nightmare is to spend a lot of money on some gigantic thing that he'll never end up playing with...