Near Mfg. or Badger fit the bill for me. I prefer steel over aluminum, so Seekins is out, and I want a recoil lug. I just ordered a Near. Richard is a fine guy to buy from and his stuff is meticulously machined. Takes a few days more to get, since it comes from Canada, but worth it. His Alphamounts are also rock solid.
I recently bought a Warne Maxima base and returned it. First, the radius at the rear was not a radius, it was a curved "V". Second, the base did not extend forward like the Badger or Near limiting the forwar range for mounting by about an inch. Third, it did not have a recoil lug.