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My two cents
1. Figure on about $50-60 per month from a major cell provider for unlimited access with a PCIA modem card for the laptop - add about 150 or so for the card itself if the wireless card you describe does not fit that bill.
1a. Go for 24 hour coverage, not by the megabyte transfer...
1b. See if the provider will let you have a trial run or else your buddy is out big bucks.
2. Driving in major metro areas is a plus - as coverage is flaky in many areas.
3. Find a site such as
http://www.dynamicdrive.com/dynamicindex6/refresh.htm
and bookmark it to refresh your connection. Some providers will drop you like a hot potato...
4. Claimed transfer speeds and realized transfer things are different, IOW, mileage will vary, just like his truck;)