This may sound awfully picky, but all the tooth bars I've noticed for sale mount with little tabs on the ends, which looks very flimsy to me. My (straight) bucket edge is nice and sturdy and has 5 bolt holes, and it just looks to me like those would be the only decent way of mounting a tooth bar.
If I knew of one with matching holes, or one where you specify hole locations (like my urethane bucket edge), or even one where I was sure I could drill the holes myself (meaning the backbone of the tooth bar covered the hole areas properly), I'd probably spring for it.