My understanding of these failures weren't due to a faulty part itself, but rather the way it was mounted to the frame, unfleshed, causing the case to crack and let corrosion in. Personally I would use the cheaper part and make sure it had a space to provide a flush mount.
I went under my 05 when I read about this issue and added washers to even things out. The case hasn't started cracking at that point so I added the washers and left well enough alone.