Preordered on an impulse with the Note 7 deal, but now realize that I owe too much on my S8+ to payoff and sell ($700+). I am really happy with the S8+ so I am thinking of sticking with it, selling the note 8 and waiting for the S9 or Note 9. How much should I ask? Which is best - Craigslist or swappa? I have sold stuff on CL before, but never swappa.