5000 games?!... not all fully paid i suppose, as most of the console games are around 40$... lol
personally, for youngsters i would prefer the Wii, which is more "physical" than "fingeral ?!"... i see more good games in the 360, but it cost more at the end anyway, as there is no real options with the default shipped version. the Wii have lower priced articles this year as it is his 3rd christmas to be on the market and games are more enclined with gadgets ... one game, one gadget...

you even get cooking parties with the Wii.. lol
i also tend to take games for my youngsters, as the teenager have his own Wii AND PS3 in his own bedroom... (financed by himself, i can't control it -- just the gore level in his games lol)