[You Need a Thneed]

My current wireless router is a piece of junk.

Looking to get a router that has a steady connection, all over the house and into the basement suite, where my brother and his wife are moving into.

Recommendations?

Is the Airport Extreme worth the extra bit of money?
Is simultaneous dual band worth it?
Is dual band worth it?

We are also in need of a good backup system, should I look at a Time Capsule?

Our computer at home is an iMac, not quite a year old. My brother has a couple windows laptops.

My iPhone would also connect to it, as would our Wii, Blu Ray player (this would require a wired connection I think), and printer.