I've used the fuji quickchange <plug>Purchased from the fine folks at http://www.robertwhite.co.uk </plug> it holds eight (i think) sheets, but isn't as sturdy as the grafmatics.
I'm not familiar with the S&S holders and if they only (?) cost 300.00 a pair thats a far cry from the 1k B&H gets for the plastic/metal holders. The ones we had were Fidelity stamped with a medical indicia of some sort and simply did not seem as if they should be so expensive. The wood ones we had were old (as in 1950's or 60's) B&J's that were used with a huge B&J process camera. These were very nicely tooled, heavy and attractive.
I would be willing to work with anyone who might want to work on building our own.. Be it the grafmatic/quickchange style or like the kind David has mentioned.