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The 3G22WV only has a 21Mbps downlink, where as the 3G42WT has a 42Mbps dual-hsdpa link. NatKiller, how many users do you want to support?
I would recommend the Sierra Wireless 4G mobile broadband Wifi device ($299), if you purchase the wireless gateway cradle (additional $199), you can support up to 16 devices.
Even if you don't currently have 4G enabled in your area, this way you are future-proofed for when it does become available.