+1 on the cortec bags, I have them on my bonnie, under the seat, and love them to death. They need no bars to keep them off the wheels since they mount so high and as previously mentioned you can put them either under or over the seat as your needs dictate.
As far as rubbing on the shock, they come supplied with extra pieces of neoprene cushioning you can cut to fit or otherwise install to protect your finish.
Wouldn't get the Triumph bags, overpriced.
Think the cortec bags come in black or blue.
Have attached pics.
Bill

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Mods: snorkel removed, bafflectomy, jets out 3 turns, summer screen, cortec tank/saddlebags, Bella Corse Highlander bars,Modre peg lowering kit.