A good rule of thumb is that a bike with a salvage title is worth about 50% of a bike in similar condition with a clean title.
Check out
https://www.kbb.com for your zip code. In my zip code, if the frame isn't damaged, and if the engine really has only 5500 miles, and if I were going to keep the bike for at least a few years, I would probably be willing to give about $3K for what you've described.
I have bought salvage title bikes, fixed them, fixed the titles, ridden them, and resold them after a couple of years. You make or lose money at the "buy" end of the deal as far as I can tell. In Tennessee the last time I fixed a salvage title it cost me about $75. I've never had trouble getting liability insurance on a bike with a "rebuilt" title, but getting collision insurance can be a problem.
I don't do salvage bikes anymore. It is impossible to get a dealer to consider them on a trade, its hard to get banks to give loans against them, its hard to be sure about the mileage since the instrument cluster may have been part of the rebuild, and everyone who comes to look at them thinks you should give them the bike for free.