I went King Tour Pack with all the parts. After having a Givi on a different bike and a friend who has the Tour Pak that hinged forward, the King tour was the choice for me. I don't leave it on all the time, but when traveling it is really nice to toss the leathers and helmets in and lock it.
I really like the side hinge. It makes it really accessible. I went with the King because the chopped or razor don't look that different and you can't put two full helmets in them like you can the King tour. I bought new even though I looked at several on Craigs List and Ebay. Off older bikes, different key, many with some hard use or needed to be painted. After adding that up, I decided it was cheaper to buy new when my dealer had a sale. Many have a 10 or 15% sale near Christmas. I just added heated grips on a Veterans day dealer sale which included a discount on install. I'm looking at the dual tach/speedo for their next sale, 15% and it is done. Get the King if you are getting it to put stuff in.