More power per se is not always better. It is easier to build a great sounding 100w amp than it is to build a great sounding 200w amp. If your listening levels are stressing the VT 100, more power may improve sound. If not, the VT 100 might actually sound better than the VT 200. If possible, I would audition the VT 200, at your ususal listening levels, and see if it is indeed better. Also, consider the additonal heat of the VT 200. Living in Florida, uncomfortably warm listening rooms are a real problem. (Hehe, now there will be a string of replies calling me an undedicated wimp). The additional money you will put into the VT 200 might be better spent on your front end, cables, or even some music.
Gary
Gary