Buying mailing lists - what criteria are you using?

[Braden Smith]

For those that buy mailing lists, what criteria are you using that you have found to be productive?

Any suggestions for the best place to buy lists?

Any suggestions for the best place for the mailers?

I am looking to supplement my driving for dollars lists with some other lists as an add on. We are doing 6 part mail campaigns spaced out every 4 to 5 weeks with a variety of mail pieces.