I bought the top mount turbo manifold they sell. It didn't come with a flat flange, and the interior had a bunch of slag on it from welding. so I basically spent anotehr #250 to have it machines, checked, and braced up. I could have gotten a doc racing manifold for that price.
As for the mount kits, including Mckiney, they are all designed to keep the original sr20 front sump oil pan, and the driveshaft angle is a little steeper than I'd like. Because of this I went with a custom fabricated setup and mounted the engine as low and straight as I could.