The Axiom Journey Suspension & Disc Lowrider, introduced in summer 2010, is a new option. The lower mount clamps to the dropouts with an extra-long quick-release skewer (supplied), like the Old Man Mountain Sherpa and Cold Springs. The upper mount falls below the 2006/2007/2008 Safari's unusually high low-rider bosses, so you have to use the supplied U-bolts. (For those who don't like U-bolts, the flat sliding plates for Surly Nice front racks could very likely be pressed into service as adapters, and motivated do-it-yourselfers could fabricate their own.)
(1) It rides a bit higher than most low-riders, so you have some extra ground clearance.
(2) It's more centered on the fork's axis of rotation than many other front racks, so it doesn't contribute as much to wheel flop.
(3) The pannier-mounting plane of the rack stands clear of the disc brake mechanism, so the backing on the left pannier shouldn't get a hole worn in it from rubbing against the brake.
(4) It's relatively inexpensive, at around $36 -- plus, optionally, around $8 or $9 for a pair of Surly flat sliding plates.