Another option is another inexpensive desktop computer and a KVM switch - 2 computers side by side but one monitor and keyboard/mouse - you can buy a second computer for around 300.00 and that you just hit a key combination and switch to the other computer. You can use VM as noted above - you might like having two computers - it is handy if one is a server (which you maintain, but do not use as a workstation) where you can be doing maintenance, etc and then hit keystroke and switch to your workstation without moving to another room, etc.
