Mimi, if you want to keep things simple, then you should go with the advice on an all-in-one thinger, I think.
I had the netgear thing mentioned earlier, but mine stopped talking to the internet. If other people recommend it, then it's probably safe to go with that, though.
I have a setup of two wireless routers and an ADSL gateway, which works really well, but it's in no way uncomplicated.