KVM for multiple OpenSuse servers 12.3 and 12.2

I have three OpenSuse servers 2x12.3 & 1x12.2. Another one will be coming online in the next few months. I am looking for a KVM switch that will work with this setup. All the machines are Dell servers. After reading some stuff on the 'net it appears that IOGear seems to work fairly well. Any suggestions? I know this is a wide open question - at the moment I do not know what video card/drivers is on each machine. If that will help I will be happy to try and find it. I am pretty new to Opensuse so I am still learning. Any help will be appreciated.