This contact form plug-in allows you to have an Email field, a Subject field, and a Message field. It looks great here, but you have to get the professional version to be able to customize your contact forms.
From the developer's website:
"The Form Builder lets you to add/edit/remove fields into the form and also to specify the validation rules for your form (required fields, email fields, etc...). Note: The form builder is completely available only in the Professional version."
See http://wordpress.dwbooster.com/forms/contact-form-to-email under the heading "The Form Builder".
If you are happy with the pre-selected fields and how it looks, as-is, you will be happy with this plugin. If you want to customize it at all, you may want to look for another one.