i have no experienced on the forks, but here's what i've gathered from other people. the foes is extremely overpriced and doesn't actually have the greatest damping. the avy is heavy but feels pretty nice. i haven't really heard anything on the white brothers stuff, it seems like there is a good number of people wondering how they work but not many really end up buying them.
As he says above.. the curnutt is close to ZERO small bump compliance. I would stay away from this fork.. No matter how you set it up, it still feels like your hands are going to fall off in the studder bumps. The AVY or any of the new boxxers/Marzocchi 888 would do what you are looking for.
Just keep the 888, its a great fork, maybe get the rc2x, if you really want a inverted then stay away from the foes, the small bump compliance is sh!t. I've heard the avy is a great fork but I have no experience with it.
What problems do the White Brothers have?
If the Avvys are as good as their shocks and you don't mind the weight,they'd be nice to check out. Do a search for reviews on them.
Check out the new Kowa Inverted or nomal 200mm forks coming out. I have the 160ss and 200ss Proto and they feel very nice,even Marzochhi like..
the whitebros are solid forks. i ran mine for 3 years without an issue & the only maintenance was a yearly cleaning & oil change - it's still on original bushings & seals. they are a bit heavy by modern standards (~7.75lbs), but in the ballpark of the other forks you're considering.
No direct link for info on it, but call Marzocchi up, and ask them for a description and price, might feel a bit costly, but its still alot cheaoer than a whole new fork and trust me, youll like it. I sent one in awhile back and got new crowns rebuild service and a works kit for 250. on top of that, they will help set it up for you. Marz has some really great people working for them.
Concerning the MTN-8. It is a big and heavy fork, also compared to the DHF versions. The upper fork legs are 50mm in diameter, but the fork is very stiff. Damping wise I think it is as good as it gets, but as said it is indeed heavy. Good for huckers and people who are very abusive on their bikes and dont care about weight, but only about reliability.