Duchesse is pretty good, if not a little sweet for the Flanders Red style. Very thirst quenching, and a nice entry into the world of sour beers. Be careful, once you go down the rabbit hole into sour beers, there's no going back.
My two favorites if you're going for the Flanders Red are Rodenbach Grand Cru and Cuvee Des Jacobins. You can get the Cuvee Des Jacobins around here; I've typically found it at Lukas in OP, KS, but you'll have to go to Illinois probably at the closest to find the Rodenbach (unless you order it online). They're both a bit more sour, but still very well balanced beers. *self professed sour beer nerd here*