The question you need to ask yourself first is "Will this upgrade be worth it just to bring me and my family personal enjoyment and fulfillment over the next 12-16 months?". If the answer to that question is yes, then by all means do it.
A whole lot could happen in the next year to year and a half. New administration, probably a half dozen changes to prime, we will see what affect the ALpharetta new home construction slow down will have on the market, and so on. I would hate to comment on what some fancy pieces of wood nailed to the walls will have on the value of your home in that time.
Having said that, you need to know that your home sells as a package. Will the crown molding add to the overall look of the house, or is it out of place? Do the other upgrades compliment it? When you go to sell the home, will you stage the home in order to get the most out of your crown molding?
When you go to sell, be sure to slap an extra coat of paint on the crown molding to make it stick out. And while you have that can of paint out, slap an extra coat of paint on the baseboards too.
Good luck, and enjoy your upgrades yourself. I have heard the sentence "It's a pity we did all this work, and never got a chance to enjoy it." from too many clients