Any way to force a specific 802.11X protocol?

We have a Cisco wifi system that offers 802.11a/b/g/n simultaneously. In viewing the network with the Cisco admin tools, we are seeing that a bunch of the Macs are connecting over 802.11b and many over 802.11a. Almost all the machines are Core 2 Duo MacBook Pros (with the N enabler). Is there a way to tell the MacBook Pros to connect to a given network forcing a SPECIFIC protocol (802.11n)?
We will be turning off 802.11b, so that won't be a problem in the future. But for some strange reason, most of the Macs are not choosing 802.11n as their first choice. We cannot turn off 802.11a because it takes n with it.
Any help, even if it means going to the command line, is appreciated.
Also, a related question, is there a way on my Mac to see which protocol I'm using at the moment? That doesn't seem to be shown in System Preferences or in System Profiler. TIA!
Cheers,
Alex

Alex, I have a Cisco AP-1131AG 802.11a/g WAP at home and I've overcome the problem by setting the a and g networks to different SSIDs. They also use different encryption keys. The only way I've been able to consistently get my MBP to always attach to the a network is to not have a network profile/preference set to the g network in System Preferences -> Network -> Advanced -> Preferred Networks. I use the a network and the kids use the g network.
Periodically however, the MBP doesn't see the a network so since it doesn't have the g network information it can't connect. I suspect this is an OS X issue but I don't have another a device to verify that the a network is still connecting. The WAP reports 'authentication failed' and then 'packet to client reached max retries, removing the client'. I resolve this by disabling and then re-enabling the MBP AirPort.
There seems to be an issue with OS X not always abiding by the Preferred Network order so only the above solution works. Incidentally, not too long ago Apple changed OS X so each network location profile maintains its own set of configurations. This is a bit of a pain for me with my cellular broadband card (I have to remember to switch between location profiles or create a configuration for every location profile). I wish OS X had an option to mark certain configurations as 'global' to work across every location.
Anyway you can also manage the issue with say one location profile for work and another for home, etc. Is your enterprise using the same SSID for all protocols? If so, then different encryption keys would accomplish the same thing but I don't know if that's possible at the protocol level.
Are you using an Aironet 1250? I wish there was a way to communicate these issues to Apple but this is way too technical for the AppleCare folks. There just doesn't seem to be a way for sophisticated customers to get to the higher level support folks and with no corporate level support organization, we just have to wait and hope someone notices the problem and fixes it.

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