Good luck with your purchase. I owned a pair of the SL-6s's for years. It was always a top-rated system. The "i" version was even better (more open sounding due to some crossover changes, I believe). The Model 12 doubles up on the bass-midrange driver, with, obviously, a bigger cabinet.
For $200, how could you go wrong? As long as the speakers are in good condition, I think you did well. Just don't expect a real "hi fi" type of sound; I remember the Celestions as very smooth and listenable.
For $200, how could you go wrong? As long as the speakers are in good condition, I think you did well. Just don't expect a real "hi fi" type of sound; I remember the Celestions as very smooth and listenable.