Need reliable form submission plugin

I am looking for a submission form that actually works. Quite frustrated with what I’ve been using (constant errors, broken forms, lost redirects). My requests:

1. No code hacks on my part.
2. Ability to attach up to 3 files for upload along with form.
3. Multiple field selections (pulldown menus, textarea).
4. Ability to redirect to a landing page.

Thanks much.