The only problem with using KTM triples is that the space between them is less than the OE triples and as a consequence you lose a considerable amount of steering lock. This is not a problem for fast open trails but is an issue for more technical and slower sections. Many people have warned me off this conversion due to this.
The latest thinking is to use the OE forks with shiver internals as these are a less sticky fork than the 43mm WP's. The problem with the 43mm WP forks is that some work great and others don't. Very much dependent on how everything is clamped up. The Marzocchi's don't seem to suffer this problem.
I have some WP4357MXMA which I will have available very soon. Revalved and sprung for an XC. They have done about 20,000kms overland but are externally excellent condition. They will need a service but will bolt straight into the XC triples and I have the correct brake caliper bracket too.
The stickyness of WP's can be significantly reduced by using SKF's new stiction free fork seals. They aren't cheap, but do make a huge difference on the initial movement of the fork.

