I like my motorola Q.
Read the fine print... it may say "UNLIMITED" internet but it really means 5gb. That includes browsing, emailing, etc on your phone + data transfer from laptop when it's tethered to the laptop. ALSO is true for aircards too which sucks since it's broadband in city.
You can get the Q for $99 now and the plan is around $140 a month with insurance, txt msgsing, tax, fees, and 1350 anytime minutes.
I use mine to check the news, directions, and plug into my laptop. With the Q I get 20KB/s on my laptop all the time so it's not slow but not broadband like an aircard either.