Each one of the languages you reference (ASP, Java, Coldfusion) will work just fine. You really have to answer that for yourself. Some questions would be which one am I most familiar with, how much time will it take to generate code with each language (Java being the most time consuming of the group). Also, for coldfusion, are you using a coldfusion server ?
[Thanks for the reply. We currently don't have Coldfusion nor any other tool. We are comming from host-based programming (via telnet) straight to GUI development, and we are evaluating wich tool to use to make web apps that comply to our needs: speed, control, usability.