Can't join "802.11n only 5Ghz" but can connect to "802.11n only 2.4 GHz"

Using an airport extreme and two MacBook C2D's, I'd like to have the airport create an "802.11n only 5 GHz" network using WPA2 Personal security. For some reason, I can create an 802.11n only 2.4 GHz network and join it, but am unable to join the exact same network using 5 GHz.
Can anyone help me solve this?
I live in an urban environment with TONS of competing networks / microwaves / sonos / cell phones / cordless phones ... on the 2.4Ghz bandwidth and want to use 5 Ghz. What could be causing this problem?

Me reporting back again - I may have narrowed down the problem, on my system at least. I bought a new Airport express with 802.11n capability and I set it up as a separate network to my stereo, broadcasting at 5GHz. It worked fine, and in fact it eliminated the interference problem I was having. Since my computer manages at 5 GHz, as well as the new Airport Express, it means that the problems I have been having broadcasting at 5GHz originate from the Airport Extreme base station. Could be that others are having that problem as well? I'm only sorry that the base station is beyond the warranty period, so I can't return it.

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