PDA phone with old vision plan?

I would like a PDA phone with vision but don't want to pay the 15 fr power vision. I want to be able to access the internet with the phone itself but don't need the full speed of powervision. I have one of the older"grandfathered" which are pretty cheap and I'd like to keep it. Are there any phones that will allow me to do this? And if so which are the best?
Thanks