with minimal expenses(mostly hardware) you get to have a predictive dialer.
Yep,
VICIDIAL is actually free. But you need to buy your own servers. As you can see, here’s a screenshot of a client of mine running VICIDIAL on 130 seats and counting (will post screen shot when they hit 180)
VICIDIAL running 130 seats.
Anyhow Im available for consulting 
What are the specs of this server?
Is this only a single server or different server of asterisk, database, recording?
Are you using Load balancing also if multiple asterisk server?
4 vicidial servers?
more like 12 now.