DH has PS2 AND Gamecube (greedy boy!). You can get a wider range of games for PS2 and places like "Game" and "Gamestation" do pre-owned ones at really good prices with loads on 'multi-buy' offer. Plus the children could bring their owm favourite games from home?
We've got a PS2, XBox, Gamecube, and a Dreamcast and I would say that , although it doesn't have as many games in total, a Gamecube has far more childfriendly games than any of the others. I find that PS2 and XBox games are far more adult in content, whereas the bulk of GC games are aimed at children.
Game and gamestation are great for secondhand games, and ebay is excellent as well!