I have WO575's on my 07 SG. You can buy blems from them for about $158. I would not have been able to find the flaw if they had'nt circled it with a black marker. Love the bars.
I was looking at the same 2 sets of bars and I have decided to go with the sweepers. I think they come back a little more from what I have read. The price is right too.
HD will install the bars, but you'll pay through the nose for it. Changing out bars isn't a tough job as long as you have the service manual, the right tools, and just a little bit of mechanical ability and common sense.