I went with the Cobra Low-Profile Solo from NFG. Cost: $300 US, and since it was supposed to come with the bike the dealer installed it at the Initial Service at 300 miles. I've put 86 miles on it since and find it very comfortable in addition to dropping my butt a few inches and improving the ride ergonomics. It did change the shifting dynamic so I had to pull the shift lever and bump it up one tooth to raise the rubber to accommodate my rather fat feet, but that was an easy adjustment.
As I said, the dealer installed it, but the L-brackets kind of stuck out the way they did it and I like a cleaner look, so I took it off and re-installed with the L-brackets facing inward, and used the stock spacers to fill the gap. Some minor adjustments to height and centering and it's good to go.
Be aware there are no springs since it mounts directly to the frame lugs, so you do the math.
Personally, I'm ok with the ride, though I'll either knock the shocks down a notch or maybe even go with the Hagons.
Here's pic of the bike: