This is your best bet in terms of combining a pocket PC and cell phone into one device. It has many different capabilities, such as 3g, which means if you are in a bigger city, you can download information very quickly. It also excels at the traditional things you are searching for, such as email, word, excel viewing and editing, etc. It is a fairly pricey phone, but at the At&t store it is selling for $100 refurbished I think if you subscribe to a 2 year contract.
I'm looking to purchase a smartphone with AT&T as the carrier. In the past I've owned Palm and Pocket PC products and I'd really like to get a phone that can double as a Pocket PC. I've done a little research and have found that the Treo line is vaguely what I want, but I'm not sure what model to get. I'd like to get the newest, top-of-the-line Pocket PC model so that it will be able to last for a while. I'm not interested in purchasing an iphone. What products would you recommend?