I have a 5.1. Go to the Counterpoint site, altavistaaudio.com, and read up on both preamps. The 5.1 appears to be generally regarded as better. They are relatively inexpensive, but in time you will likely have to ship it to Michael Elliott for repairs. My advice- when you experience your first breakdown, save up and get the unit upgraded. Reliability issues are not an issue with the upgrades.
