These guys are a being little mean

but they're right, keep on kickin', not too hard, though.
The 686 with the 2-1/2 inch barrel doesn't show up all that often and when they do the average price trend has them at about $560. Good ones, such as what you described, would go for more.
Here's the chart I have from my track on the model:
Here's the track text:
Smith & Wesson 686 Plus Revolver in .357 Magnum, .38 Special, Plus P, 2-1/2 in Bbl. Bluebook of Gun Values (30th Edition) indicates between $515 in 98% condition and $650 in 100% condition for this gun. I have 65 recorded prices for this model gun from $350 to $856 over a period of 5 Yrs 7 Mos ending February 18, 2010. The average price as of that date was $522. No refurbs, no refinishes, regular sights, adjusted to two magazines (if magazine fed), all represented as 95% or better, no distinction for import location or engineering revision, if any, no special editions, no distinctions for box, papers, tools. Current or last MSRP is $964.