We've had a pretty extensive discussion about the free viewers available in
This Thread. That should give you a good idea of what's working now and what's not. The TL/DR version is most of them aren't setting the world on fire right now; but most are helpful if you're patient.
I can't caution you enough
against purchasing views right now. Just don't do it. You're right in that they are all very over-priced considering what they can presently deliver...which is very little. A big chunk of my business these days involves YouTube, so I can speak from experience here. Don't waste your money for the moment. If something truly does work, you can count on members of this forum to be the first to shout it from the rooftops. Check back daily for updates...we're all here to help each other.
You're better off promoting your videos organically by submitting them to social networking sites like Reddit, Facebook, Digg, Twitter etc. This only works, of course, if your video will genuinely develop a following.
Beyond that, promote, promote, promote. Just browse the forum for a while and you should uncover a number of cool ideas. Always check the dates on threads here, though. The state of YouTube changes rapidly. Something that worked a year ago will almost certainly not work now, for example.
Good luck, man...and please let us know if you find any hidden gems!