B+W MRC or Nano, probably best to use the XS-Pro mount (slim, but with front threads for the lens cap). For a dSLR, there is no difference between UV and clear filters, get whichever is cheaper where you shop.
As for the ND, it depends on what you want to shoot. I have B+W 3-stop and 10-stop filters, the 3-stop is good firm moving water, etc., but a 6-stop would work, too - remember that you can bump the ISO to 400 with no meaningful penalty on recent FF bodies. The 10-stop filters are great for architecture - a 30-60 s exposure means people passing by are effectively invisible.