I'll give my .02 cents even though you asked Sushi. I don't think that the VP100 becomes a better choice in a smaller room. By all accounts, the VP150 is the better speaker than the VP100. Standing alone, I love my VP150. It's not like the VP150 is some overwhelming beast of a center channel. It is a very refined, clear, yet powerful center channel that performs exactly as it should.
Taken to extremes, sure there could be a case where the VP150 is too big for a particular room, but I think that for the most part, the VP150 would win out in most applications. This is different from front speakers, where it has been noted many times that the M80's or M60's can just be too much for a certain size room, particularly where the soundstage would be collapsed if you are sitting too close. I don't think this would generally apply to the center channel, but others can correct me if I am wrong.
