I wouldn't touch a Connoisseur BD1 with a barge pole. I only bought the second one I owned because I couldn't believe the first one was so bad. Sadly the second was no different.
As to stuff I'd have again, there isn't a huge amount, as if it's that good, I've still got it. I have bought second examples of the Technics SL-P1200 and RS-9900 as I shouldn't have sold the first ones!
That said, I wish I hadn't sold my uncle's EMI EPU-100 arm and pickup heads. That was a silly decision.
Engineers: fixing problems you didn't know you had in ways you don't understand.