Keep an eye on Amcat. I met with the company recently and they seem to really have passion to succeed in the contact center market. The company has been around for 15 years but new management is really evolving their strategy and will likely be achieving great growth gains.
The company has roots in the predictive dialing market and they have recently evolved into a feature-rich contact center play with focus on inbound and outbound. They recently came out with an IP-PBX and will soon have tight CRM integration (they currently integrate with other CRM solutions and they will soon sell their own). They are no longer a dialer only company, There is CTI, IVR and a full featured ACD. We will keep you posted on how the company is advancing.