I've been working with my little Duet for the past few months and have had nothing but good fortune, but I'm ready to move up to something with more channels. That being said I'm going for the RME Fireface 800 and probably the Big Knob for my monitors. I'm asking for a caution-check from whomever would like to comment as these are my thoughts.... The RME obviously affords me more interfaces, this is the primary goal. I understand that their converters and pres are, for all intents and purposes just as good, if not better than the Duet. The RME does not have an exterior volume control, thus my reasoning for looking at the Big Knob. The Duet has unbalanced outs for the monitors and I've had an outstanding issue where my monitors emit a nasty buzz/hum/squeal, so I'm hoping this will help clear things up. Additionally, the Big Knob appears to have a good quality monitor mix about it (based on what I've read). All of this will be used with an iMac/Logic 8. I have a Great River and a LA-610 as my preamps at this time. Are there any points of consideration that I've overlooked or perhaps something I need to know about that I'm just not seeing? I solicit and welcome any comments that you can throw my way. Thanks.