Many of us might define "good" as "USB for KB/mouse and digital for video."
With that in mind, I bought a "good" KVM last fall for $100. It's a Belkin 4-port SOHO.

Works well enough, no complaints. Full cabling was included for USB, DVI and sound (Line-out + MIC) for all four ports. Nothing else with digital video switching was even within 2X the price at the time.

Cheers