I was initially looking at
http://www.fordcobraengines.com, i.e. Th Engine Factory, but have decided to go with Keith Craft when I pull the trigger on my build.
The Engine Factory is way out in front with the marketing for a full turn key solution and cobracentric looks, but this is all window dressing... cobra valve covers, air filter and all of the colors. Keith can do the same if you really want all that. Also, depending on the kit that you buy, that awesome looking cobra air-filter may not even fit under the hood.
Keith Craft Motorsports is in Dallas (Plano) and can do turn key for about the same amount of money or slightly less.
I am convinced that a KC motor will provide more horsepower from the same size block. The local storefront operation at KC is also a big selling point for me.
Ask for a copy of the Engine Factory cobra video then visit Keith Craft Motorsports in Plano and you will arrive at the same decision I did.