Should I go with PPC (recommended bid is .50 - .75) or CPM (recommended bid is .25 - .30)? I like the idea of my ad showing a ton of times and being able to receive tons of clicks without having to pay .50 for each one. Any thoughts / experiences?
It depends on your site and how much signups/sales it delivers per click/impression etc. You're going to have to test all of that to find out the perfect advertising method.