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As far as used prices, you could check the completed auctions on ebay to get a rough idea.
Bryston makes excellent gear and whether a B60/2B/3B is sufficient for your needs depends on how loud you like to listen, speaker efficiency, room size, etc. Really the only way for you to know is to try to audition them in your system in your home. As long as you're not driving them to clipping, you probably won't notice much difference sonically. Bryston tends to be conservative with their specs so their 60 watts is probably more like 80.
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