I currently have a HK 2.1 5 channel amp. I am wondering with all of the used 5 channel amps available around the thousand dollar mark, can I make a signifigant upgrade? If I buy another amp in this price range, will it be a noticeable improvement? I saw a Chiro 500 amp for $800, anyone have any info on this amp? Well, any recommendations in the $1000 dollar area would be appreciated.