I have used nothing but Belkin KVM's with no problems EVER! Highly recommended.
Set up a couple of small businesses with their 4-port offering during the W98 days.
Both are still in use today with XP (24 hour shift-work companies). Another (a laboratory) with an 8-port running 5 units.
In my home, I've also run a 4-port since W98. Still working today with four Windows 7 machines.
You can look at their 8-port if you feel the need for more than a 4 pc hookup.