There's usually no need to buy that stuff. Most people already have a monitor, keyboard and mouse that came with their old PC - just plug them into the Mac.
With a KVM switch, it's easy to use the monitor/keyboard/mouse on either the Mac or the PC with the push of a button. Or just get rid of the PC.
Most people will find the $499 Mac to be a major improvement over their Windows PC.
I think we have returned to MacFantasyland
Being that Mac's hold 3% of the market - the overwhelming majority of computer users don't even consider the Mac a viable computer.