Another consideration is the 2A3 version of Dignity Audio's amplifiers. They can be used with or without a preamp. If you're anywhere near Brooklyn NY they're definitely worth a listen. Alan at TAS Audio builds the speakers he demos with the different SET varieties that they sell. He uses the same drivers I have seen in the big name brands but tunes the crossovers accordingly. Very musically involving & amazing sound quality for a relatively inexpensive system. I visited the store for 2 years before finally purchasing a pair of the 300B amps. I kept trying to match the sound quality at home with my more expensive stuff & was unsuccessful. I'm pretty happy now & put some money back in my pocket too.