I would not recommend changing it to a text instead of a select list, this will allow for potential problems wit the taxes not working correctly and will mean you will need to do a lot of extra work for validating the input.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.