KVM Advice needed with PC and Mac

[MiketheBook]

I currently have a Compaq laptop with an external PS/2 keyboard and USB wireless mouse plugged into a VGA Acer monitor. But I am about to buy a Macbook with a glossy screen I don’t like so I would like to use a KVM switch if possible to have both computers switchable on the Acer monitor. I will probably keep the existing mouse but switch to a Mac USB keyboard if that will also work with the PC. I know nothing about KVM switches or setting up such a system and would appreciate any advice I can get about buying the right switch etc and suggestions on product.