KVM switches w/out compatability issues (linking 2 x6x, z61)

[codek]

I'm looking for a KVM switch. Did some research and found out a lot of KVM switches have compatibility issues with the keyboards and what not.

I have 3 HP 2065 monitors connected to two x6x series and a z61t

I want to use a old model m keyboard (ps/2)(buckling spring of course!), sometimes an ultranav or a variety of other keyboards in this setup.

Do you have guys any any kvm switches you guys like to recommend? btw, each thinkpad will have it's own dedicated monitor.

optional: also want to maybe hook up the sound to the kvm switch

[codek]

anyone have a KVM they like?