Any Advice on Data provider for Direct Mail? Good Lists?

[Logan Hand]

Hey guys I hope everyone here on BP is doing great and ready to crush this 4th quarter! 

We do alot of marketing here at my company, and although we do Direct Mail, I would say it could use some work. 

I am open to any suggestions or advice, but please back your advice up with data like response rates etc. 

Here is what I am currently doing with Direct Mail. 

We do between 5-7,000 pieces per month. We have tried Jumbo Post cards, Minis, and the handwritten letters. Ultimately we stick with Minis because they are cheaper and the first class mail helps alot. 

We mail to the following Lists from the following Sources: 

- NOD Tax defaults ------- From Rebogateway

- NOO (Non Owner Occupied) --- Rebogateway

- PRe-Foreclosures --------- Realty Trac. 

We have tried these methods also and weren't exactly a fan

- Absentee owners with Equity....... Listability data

- Inherited Property Lists.......... US Leads List. 

We are in the process of scaling and we have plenty of money to throw at these marketing initiatives. Anything that can help me fine tune the machine will help. 
Thanks so much guys!