They are all great. The Realm album may seem inaccessable at first but give it a few listens and you'll find it so goddamn rewarding, the tech riffage is unfuckingbelieveable.
The Heathen, well that should be mandatory, great album apart from the stupid theme-tune-esque major harmonies in the final song and the F&J 3-disc is grand, I well prefer the remixed version over the original.
Definitely chuck in By Inheritance aswell. I'd be surprised if you don't like it.
Dave, No Place for Disgrace isn't a bad album either despite the slightly weak production. It all went wrong for Flots after that. New album is utter pisswankage.