Treo 650; T5; or HP iPaq h6315 (Score 1)

Enjoy reading everyones comments on the Treo 650...was seriously considering purchasing one...however the comments made are making me second guess my decision. I am in the market for a handheld device that can handle my management software (ACT); Excel files and Adobe Standard files... I had been looking at Treo 650; T5; and HP iPaq h6315. Any advice would be greatly appreciated. Thanks, ham523