Another vote for the S45-2's!
I bought a couple of fairly grubby pairs for very little money from a local ebay seller when I first started buying older B&O at the beginning of last year.
I had bought them as a stop-gap assuming I would upgrade to something better before too long. I have now restored them from their previous shabby condition and use one pair with the Beosystem 5000 that I purchased a few months ago and I have no plans to upgrade them in the short or medium term. Thay sounded pretty good with my Becenter 7000, and awesome with my Beosystem 5000, putting many newer speakers to shame.
They are very good speakers. I have read here and elsewhere that they lack Bass, but to be honest it is not something I have noticed personally as there is more than enough for bass me. A capacitor kit from Martin would be a sound investment, but it is a no-lose situation as you will almost certainly be able to sell them for more or less what you paid if you don't like them, which won't be much!
Simon