I do have all the Afghan Whigs albums, I think the only one that can pretty safely be skipped is the first, Up In It, and even that one is worth having if you like the rest.
I can see where starlight's friend is coming from on Gentlemen, compared to what's on your list, it's pretty heavy. But I don't think you should write it off, it's an amazing album, and the intensity is genuine and merited.
That being said, I completely agree with Carlos, depending on what mood I'm in, Congregation is my second or first favorite Whigs album. It's a different sound, though, from the last two. It came out on Sub Pop, while Sub Pop was still Sub Pop, the production value is far lower, but the rawness works for them, makes them sound even darker and more soulful than they already are.
eMusic had Blackberry Belle, downloaded it this weekend. Definately the best post-Whigs stuff I've heard, but yeah, not quite there, it's missing Curley (whos current band isn't worth listening to, sadly.)
Also, can dig on being burnt out on post rock since TEINACDP, and Caspian doesn't have nearly the composition chops Explosions have (for my dollar, no one does), but they put together a pretty solid, dynamic album.