I have vetted 20 times more plugins than the number that actually make the cut on our websites. Contact Form 7 + Contact Form 7 DB together make forms so easy to create and manage.
The CF7 DB plugin means I don't have to dig through emails etc when sales people lose their leads (or don't follow up). I don't even need to find the contacts, I just send them a link I create through the DB tools. The best, in my top 10. Perhaps top 5.