If you do decide to get the wii, PLEASE don't purchase it with the expectation to live up to Playstation quality. Sure, some of the games have better graphics ((some)), but the online is nothing impressive , won't play your dvds, and does not have high-def, hard drive, or any of the other nice additions you can find on the other consoles.
But it does offer some great game play, but the selection is drowned with it's massive crap of 3rd party games. I think you might be happier with a ps3, personally. It seems to be what you enjoy playing, and you already have games for it. However, if you owned a gamecube/64 and loved them, or still enjoy Mario games, then the wii will not disappoint.