I would go with the crowd and say money but if you look at the amount of games I have purchased for my Wii this gen I could have easily bought a 360 during that time, I haven't though because if I do buy a 360 I would feel the need to buy a bunch of games for it (because there are a lot of 360 games I want) and I would end up not being able to get the full Wii and XBox360 experience. I therefore stick with my Wii and am able to buy a bunch of games for it. I do plan to get a 360 however but it will be at the end of this gen when I can hopefully get one with a decent size HDD for ~$200.
Currently dreaming of: DKC4 or Sonic the Hedgehog 4 (classic 2D platformers) for WiiWare, Smash Bros. for DSi, New Super Mario World for DSi, a Wii remake or true sequel of Final Fantasy Tactics.
One down, hopefully more awesomeness to come.
