Better idea for the money 2 or multi ch pre-amp?

I would like to start a second system in one of my bedrooms or office. I only have the speakers which are NHT T6 evolutions. I only plan on havinng two channels so would a HT processor be a better bargain now days or should I stick with a 2-channel pre-amp? I ask this because the prices for used pre processors are at real bargains now days. For example: I can get a Anthem AVM-20 pre/pro for under $700 or can I get a 2 channel pre-amp that would sound better for the price? I currently have a Aragon Soundstream pre/pro, so I could replace it and use that in my other system. I'm not as familiar with the 2 channel gear so any advice would be much appreciated. Also, any advice on a 2 channel amp for the NHT's would be greatly appreciated. Thank you
Doug