Well, I decided on the Old Man Mountain Pioneer. Got it mail order sight unseen (other than photos). Weighs two lbs (vs 1 lb for Tubus low rider, and 3 for Surly Front). Seemed like a reasonable compromise. The rack certainly looks burly. Old Man racks attach by putting the (extra long) quick release skewer through the rack foot (and then attaching to the brake bosses). I'm not sure if this is good or not. 7000 miles and I'll let you know. At the least it saves you having to have braze-ons for attachments. But since I have a Surly LHT that isn't an issue. Meanwhile the bags hang a few inches lower than the platform but the bottom is still a good 6"s higher than the lowriders (which was my objective - for use on trails and through bushes). But more to the point, and one thing I didn't think of, is the bags are further forward then on a lowrider rack. forward of, and above the pivot point axis of the fork. When loaded up (I've only been around the block a few times at this point) it definitely has a less stable feel. You kind of have to fight to turn the bike - at least compared to using low riders. I'm sure I will get used to it, but it definitely feels different then using the lowrider racks. I suppose in retrospect that that would have been one advantage of the surly rack (extra pound be damned) that as I understand it you can put the bags either high or low, so cruising on blacktop you could just leave them low for better handling.
here is a picture of the Pioneer rack. http://www.oldmanmountain.com/Pages/RackPages/FrontRacks.html
(edit; I guess you can't upload photos to this system, too bad)
I will post photos of my bags with the two different racks for comparison.