US Cellular is now offering Galaxy Tab for mere 200 dollars. This is cheaper than T-Mobile that is selling the tab for 350 dollars (after $50 web discount), if you agree to their 2 year contract. You can go for 25 dollar / month for 200MB data plan (or $40 / month, 5GB data plan).
Now coming back to US Cellular. These folks are charging you 55 dollars per month for 5GB bandwidth. If you pass that 5GB limit and let’s say, you download a 700MB movie, they will charge you 18 dollars!
My recommendation – go for either Sprint or Verizon.