I bought the Horst forks which include a frame that attaches to the QA points after you remove the bucket and include the material fence and am very happy with them. I use them for lifting large logs, large rocks that won't fit in the bucket, etc. The forks are adjustable and slide together or away to adjust to your load or to a pallet. I bought the 48" forks, but now that I've had this summer to use them, I realize the 42" forks would have been long enough and would have saved me a small amount of weight.
For what it's worth, I think most of the fork suppliers make good units. But I didn't want to go with the forks that attach to the bucket itself. I've seen too many that bend the bottom of the bucket and then you'll never again have a smooth even scrape with that bucket.