Gadget - Can you recommend a PDA phone with a large screen that i can use with T mobile web n walk ?

Can you recommend a PDA phone with a large screen that i can use with T mobile web n walk ?

My current phone (HTC Touch Duo) has a screen size of 2.7 inches, which i find too small to run windows applications.

Here's an online resource that will search and compare phones, providers, and plans available by location. Should help you find what you need. http://www.cellphoneriver.com/?crid=11432