Budget? Its going to be hard to find unless you want to spend a reasonable amount, afaik.
You can google IP67 touch LCD embedded (or IP66, whatever), and you'll find some results.
You could take the existing crowpanel display, and seal it inside a waterproof enclosure. So the front glass will still be accessible.
I've never seen touch panels work that well when it is raining directly on them though. So thats something for you to test.