The Wii would be a lot better if you can get your family to play, or if you have a lot of friends who can come over. It's just a great party console.
If not, and you're finding less time to play, then go get the PSP. It has an amazing library, and right now, even better than the Wii, in my opinion. It's sad that loads of people think it's cool and in to troll Sony these days.
I bought the PSP because I couldn't play with my consoles often these days, so I was thinking I could play while waiting for classes. I bought it before the DS because of the very active homebrew community, and that it can play PS1 games, since I was also in the mood to replay some old games. That's not even including PSP games themselves. I still spend more time with my PSP since I can do more and play more games on it.