Personally, I would just wait until the new processors come out from both companies and the new GPU's come out before building anything, as they will most likely be better than any of the options here.
Real talk? In all likelihood never. The profit margins on these just isn't high enough for a retailer to be able to sell them at a discount worth a damn. Worth trying but int he past MD has had no luck getting a price worth setting up a group buy over.