If the real problem is the rear of the pannier swinging into the spokes, then a better rack is the real answer. Racks with a bar further back and down to prevent the pannier from hitting the spokes will help with any pannier.

I have this rack on my LHT:
http://www.axiomgear.com/products/ge...racks/odyssee/
I'm using some cheap panniers, and haven't had any problems. On the downside, your interchange panniers probably won't fit.

I used to carry my laptop in interchange panniers on an interchange rack. I dropped that laptop in traffic several times, and wrecked fenders twice due to the pannier hitting the spokes. The laptop has survived, but I won't use that pannier/rack combination again.