Carver TFM 45 or Cambridge Azur 851A

Thanks - The room is about 15x20. It's the living room which opens up to a dining room. The Definitive speakers are mounted in the vaulted ceiling angled somewhat towards the listening area. I listen to both jazz and classical orchestra music at moderate volume. I have no problem buying something used - my main criteria is that it be trouble free for the next several years. 40 years ago I used to work for Marantz and had an 1180DC amp. All of the potentiometers became oxidized and I would up selling it on E-Bay. I don't want to deal with that again...

When you say reliability, the first brand that I think of is Bryston.  20 year transferable warranty.  I would look at the 3 or 4 bsst or newer.  

You might also look at Classdaudio and Emotiva.  Both offer high value for the $.  

Apparently that Carver amp is a very popular item.  One in mint condition just sold on ebay for $430 with 42 bids on it.  There are lots of great power amps on ebay for lots less that will greatly outperform the Cambridge Audio, IMHO.