If its not broken, why fix it? Looking at the pictures I see on the net, it already has eyelets and canti brake bosses (which might be good upgrades if they were lacking). And probably a nice amount of trail for easy stable riding. If it is broken then:

How about this nice steel Surly fork

http://www.universalcycles.com/shopp...ls.php?id=7000

or this Tange Infinity CroMo fork

http://www.universalcycles.com/shopp...1&category=704

Winwood Dusty Carbon

http://www.universalcycles.com/shopp...1&category=704

Or the old Nashbar Cyclocross Carbon

http://www.nashbar.com/bikes/Product...1_10000_200456