Would using a usb hub to connect a keyboard, mouse, and VGA monitor produce a lag of any kind or slow down how fast you could type, enter info, or switch between programs? That would drive me nuts.
Is only two usb ports a really big deal if you can get a usb hub to add more usb connections? They are pretty cheap.
No USB keyboards/mice require very little system resources and use very little USB bandwidth so they will work fine connected on a hub.