I hate to break this to you, but there are MANY forum regulars who upgraded from the VP150 to either the 160 or 180 and won't shut the hell up about how happy they are. And I think that the VP150 does not have high resale value now due to introduction of the others.
I really don't think that a bigger amp is going to make more audible difference than the other things that have been suggested. Your room isn't THAT big, and unless you are determined to cause hearing loss, I don't see how having more unused watts is going to help. I added an 200wpc Emotiva XPA-3 to my 130wpc Onkyo 805 and I really want to notice something besides the blue LED's, but I can't.
And I don't believe in the biwiring/biamping thing.
Is your system not loud enough?
