I've got hitech for b+w and they're fine. if you end up with glass filters at any point, check the thickness first. most are much thicker than the resin filters and not all filter holders have the ability to add shims to accept them. I use the lee filter hood/holder (not sure which one) and it's far better than the cokin P and the hood is a much in many situations but also keeps flare to a minimum when shooting LF where lens coverage can lead to a loss of contrast.
I've heard a lot of negative feedback regarding the cavision stuff.