Holler, congratulations on your good buy on the M80s. I can understand your excitement since I certainly didn't have such excellent speakers when I was a student. However, what you "found" about powering them isn't necessarily correct. Any modern amplifier will work with the M80s; the question is how loud and how long. The typical modern receiver, such as your 304, has significant power capability at 4 ohms, regardless of whether it's officially rated at that impedance. Try it first before you assume that there'll be a problem. You may well find that you have adequate amplification for most(or all)situations. If not, there's plenty of time to think of a future replacement.
