I have a guy locally selling a Titan Black (06G-P4-3791-BR) 6GB for $100 and I can probably get a second one (he has three) for about $150-$175.
I'm assuming this would be a pretty good deal, but I have no clue on the Titan's. I would assume $150-$175 for an SLI Titan Black would be good, or would it be better to just grab a 1060 6GB for $160 from another local guy?
If you don't care about power consumption then it is not a bad deal. SLI Titan Black is quite a bit faster than GTX 1060 by a good shot when SLI works perfectly. but if it isn't a single Titan Black is slighty slower.