New Macbook Pro reluctant to connect to Airport Extreme at 5ghz

I brought the latest 17" 2011 Macbook Pro back in April this year, to replace an older 15" MBP. I'm mostly happy with the new machine, but have noticed one frustrating problem.
When waking from sleep, and perhaps even from booting cold, the Macbook Pro always connects to my Airport Extreme at the slower 2.4ghz speed. My old Macbook Pro was always keen to jump onto the same network at 5ghz unless it was too far away to get a good quality signal. I still have the old MBP and it still behaves this way, correctly. The new Macbook Pro is meant to have more ariels in it for wifi (albiet unlikely to be present in my year or two old Airport Extreme) but I would expect it to behave at least as well as its older sibling.
The thing is if I disable Airport and re-enable it will then mostly lock on at 5ghz, its just frustrating having to do so. It's not even helped by locality, I'm currently in the same room 1m away from the Airport Extreme and it still wakes up onto 2.4ghz.
I've yet to upgrade to Lion, so am running on Snow Leopard. I've heard friends have niggling problems with Wifi waking from sleep anyways, so I look forward to seeing how this problem alters when i do upgrade.
Any suggestions, or anyone else experiencing the same behaviour? Thanks
Cheers
Jim

Delete the connection information for the 2.4 GHz connection and it won't be able to connect at 2.4 GHz.

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Clare in Chi wrote:
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