EPI 150's are great
In the past year and a half I have owned Large Advents, AR-5's, AR-2AX's, Dynaco A-25's, AR-4X's, and EPI M-150's. I upgraded the capacitors on the crossovers for the Advents, AR-5's and the EPI M-150's (later model tweeters also on the EPIs).
Out of all of them I think I might like the EPI M-150's the best. They are very smooth and have a great balance to them. The Advents are very close, but there is just something about the EPIs.