Here’s a good one, with metal anchor. I think the wood ones with multiple holes might be the best design, but the ones I found were deficient (one got bad reviews for being too small, the other didn’t have an adjustable strap). So this Xeros metal one wins out. And the price is right.
http://www.amazon.com/Xeros-Anchor-Endpin-Rest-Cello/dp/B000FCJUV8/
Rock The Cello 