I don't think you could go wrong in either case, it would just be a matter of personal choice and your budget since audibly there would really be little if any difference between any of them.

For me personally, if the choice is three channels, then I would go with equal power across the front, however, in order to get the best use of that power and if you have the space, I would switch the 150 for either a VP160 or 180.