This is a killer little system you have, and you should count yourself very lucky indeed. I would personally avoid vintage speakers unless you know they have been thoroughly checked out. If you go new or used, just make sure they are tube friendly. I would suggest 6 or 8-ohm speakers, as these tend to be easier loads than 4-ohmers. Because there are so many types of speakers out there, I would keep your selection criteria very simple (your listening space and how much you are willing to spend). Then, find a reputable dealer, give him your criteria, and sit down and listen on a Saturday afternoon with YOUR CDs. Whatever you do, do not buy blind! Also, make sure you take some time to learn how to maintain your new gear (i.e. changing tubes, never powering on tube amps without speakers attached, turn on sequence, etc.). Once you find some speakers, you will have one sweet little system.