I've been contemplating some changes in my Aguilar rig for some time, and want the expert opinions of all of my fellow bass geeks before I do anything drastic. Right now, I'm running a DB680/QSC RMX850 through a GS410 cabinet. For the most part, this is an awesome setup. However, while in a studio situation, I had the opportunity to hear the DB680 by itself on tape, sans the QSC and was blown away by how much fatter sounding it was! This got me to thinking of how I could approximate this sound live. My first thought is that I could sell the DB680 and get a DB750. This would be slightly lighter, but would it really be any different than what I currently have? I've heard people mention that the DB750 sounds strikingly similar to what I am currently running: all tube Aguilar preamp with solid state power. To those who have owned both setups, what do you think? Is the DB750 thicker in the bass, or do I essentially have the same thing? Last but not least, is the DB750 comparable to the 680 in the studio? My next option would be much heavier and much more difficult to locate. How would the DB728 improve upon my rig? Does it make that much of a difference? I've heard rave reviews about the DB680/DB728 setup, but have never heard any comparisons to the DB750 in terms of live sound. I don't care about the weight if it pays off in terms of creamy fat bass tone. Any info would be helpful. Thanks in advance.