I don't know if they are the best provider in Chicago but I have been with them since they were Primeco back in the day. Very happy with them but their data plans are rather pricey.
The best place to buy your Treo if you are a new Verizon customer is on Amazon. I bought my Nextel for business (landscaping) at Amazon and they saved me a load of money.
http://www.amazon.com/exec/obidos/tg...ess&n=13442131
Treo 650 that is $299 at the Verizon store/web site is only $149 after rebates at Amazon.
http://www.amazon.com/exec/obidos/tg...ess&n=13442131
Treo 700w that is $499 through Verizon is only $299 after rebates at Amazon.
Of course you have to their full price up front and get the $150 rebate through the mail but it is a heck of a deal.
