Recommended Wordpress Contact Form plugin

[mpsn]

Hi, I am building a small website for and it needs a simple registration form for volunteers to sign up, it needs stuff like telephone number, name, email, etc, anyways, does anyone know of a quality wordpres contact form plugin that validates the form fields (like email must have @, telephone number can only be integers and only 10 number etc), also needs to be secure, have ability for user to subscribe to email for newletters and also when they submit, to send the information as csv or other text file to the person who will check the applications for volunteer work, I was thinking maybe it will be sent to them as zipped email or possibly sent to WordPress db in a new field and then the admin can simply export it to a csv or whatever format.

 

Btw, I'm using WordPress 3.3.1.

 

Any help appreciated.