With your choice of exquisite cars it sounds like $$ may not be a huge factor but that is just a guess. I will also say that this being a buyers market, you ought to hold on to it long enough for the cycle to change. Based on some solid data and postings here on the web, it sounds like most of the GT dealers, Shelby included, had strong GT sales in the past couple of months.
Soon enough the laws of supply and demand will take effect and you will see the prices of the GTs go up once again. In short, hold on to it if you can and wait till the market dynamics smile in your favor. In my opinion solid clean GTs will always demand near MSRP when it is a seller's market.
This is precisely what I am doing with my 67 GT500. Upon sale it should cover the cost of my Heritage. Fully restored, 1 of 10 White Factory AC cars in 67'. Fun as hell to drive with a 3.50 posi back end.