2 monitors or kvm switch?

Im sorry in advance, as this talks about Xbox 360, but i didnt know where else to go. :/, anywho, im buying a 24" monitor for my xbox, so thats around $200-$300, now, my question is, would it be better for me to get 2 monitors or get a KVM switch? if i were to get a second monitor, for my computer, it would be a cheap $100 18" monitor, or, buy a KVM switch, any advice please?, is a KVM switch worth it? thanks and sorry in advance.

Yea most decent monitors will have both HDMI and DVI and you just swap modes with a button on the monitor.

ohh, ok thanks, but see i use a headset for my 360, so i need to buy a VGA cable regardless, so then that takes me to my original question, would it be better to buy a cheap $100 monitor for my comp. or buy a kvm switch, sorry if this is frustrating, xD, but your really helping out an uneducated kid here, and does anyone know a trusted, or recommended, monitor company? thanks.