You have to get a Wii

they are so much fun

To start with all you really need is the wii-mote and nunchuck for most games.
If you end up downloading lots from the store you may find you want a good sized memory card but you can wait and see for that.
Most other games come with the things you may need - like Guitar Hero/Rock Band you can get a bundle with 2 guitars, drums and microphone, Wii fit/plus comes with the balance board.
I think if you choose the games carefully - don't just go out and buy a game without checking reviews - you will play them.
Some you may find are better for multiplayer and some are better for just one player (when you get the split screen it can be hard to see - but we have quite a small TV).
Let us know how you get on
We're getting Wii Fit for Christmas (then maybe the Wii Fit Plus a bit later) - can't wait to try it out
So what games did you get for the PS3? I really want Little Big Planet

They've come down a lot in price here recently so hopefully we'll get one soon. I want to wait until we have an HDTV first as I don't see the point with our TV at the moment. We may even be able to negotiate a good deal if we get a TV at the same time