I've started running steel rigid forks in prep for next years TD.
On my aluminium frame it rattles my teeth out on anything rougher than forestry track but it rides well. I've ridden it on up to 30-40 miles back to back days without issues on my wrists.
I have the intention of swapping my frame out for a 29er Salsa El Mariachi or On One Inbred towards the end of the year and this will hopefully sort out the remaining 'judder' from the trail.
Let us know how you get on
hopefully see you in Banff!