Whether you really need to go to all the expense of converting to WP forks is up to you and your personal needs. Several here have done this conversion. These are the triple clamps you'll need (not cheap)...

http://www.off-the-road.de/XT-660-Z-...-machined.html

You could end up spending half the value of your bike on the forks!

I went for cheap-skate replacement springs option, and you'd be amazed what a difference it makes for little more than a hundred quid. Obviously it won't be anywhere near as good as a full WP48 setup, but you pays your money and makes your choice...

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