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5GHz opened up pretty recently. This along with high of cost of making a 5GHz radio and wider acceptance of 802.11ng is reason for Wifi still sticking to 2.4 ISM band.

A lot of higher end N routers are dual-band; they work on both the 2.4 GHz and 5 Ghz bands. It would be silly to have a router that only worked with 5 Ghz, since many laptops and almost all cell phones only work with 2.4 Ghz. Routers that work with 5 GHz should be relatively easy to find - just make sure that you search for "dual band" instead of 5 Ghz.

I use the 5Ghz band. Both my Time Capsule and Macbook support 11n over 5Ghz.

Look for 802.11a support, otherwise Apple AirPort.