I got a Corriente reining saddle for $650 shipped to California, brand new, from their bargain bin and I've heard that their customs aren't much more than that. Yes it has a few minor flaws, but nobody notices when they see how shiny and pretty it is!
AND it fits my horse way better than my old saddles. I had to ride him exclusively bareback for almost three months!
As mentioned before though, FQHB w/7" gullet is all they come in. If that'll fit your horse, I'd go for it for sure.
Now having said that, if the saddle being sold on CL is EXACTLY what you want after talking to Corriente about other options, I'd buy it from CL to save a few bucks. Maybe offer $550-$650? It's listed as OBO so who knows! Again, though, only if you REALLY love that particular saddle otherwise I'd go custom from that maker.
Best of luck!