only reason I had for buying a ps2 was the Silent Hill series but those came out on PC so no other games on it justified me paying 200 bucks (at the time) for the console plus 50 bucks a game. besides you can only play gt3/4 and GTA for so long before they become stale.
the gamecube on the otherhand, 100 bucks, bought 10 EXCELLENT games that i had tons of fun with for about $10-$20 each (used of course) and i havent regretted it since and im still playing it to this day. im more than sure it will be the same with the wii but this time the stakes will be much higher ($250 vs $600)