What's the recommendation for carbides these days. I had bergstroms on my fusion, with the ski savers and shims, and they made it well over 8,000 miles and were still pretty good when I sold it. Have a Cat 137 now. Stock ones have about 2,500 on them now and probably should be replaced. I don't see many posts about carbides. Checked bergstrom's site and got a little sticker shock - they are over $200 now.