jeremy, of that list, I'd go with Blue Wheaten Ameraucanas and the imported type Orpingtons (they're all English). I personally prefer the American standard Orp to the imported ones, but that's just a personal thing. (yes, I know, you're surprised that I chose Orps over Dels)
I adore my Delawares, I really do, and they need more serious breeders, but as you are quite aware, they are extremely challenging! Your frustration levels will be lower if you skip the Dels, IMO. I think Delawares need breeders who only breed Delawares, in order to truly contribute to their resurgence in a quality way. JMHO. Color on both Ameraucanas and Orps is less trouble than the Delawares. But, the Orps' personality cannot hold a candle to the personality of a Delaware! I still have my Blue Orpingtons. Suede is a sweetheart, but the girls are not super friendly, never have been-I've had some from different lines and they are all the same, personality-wise. Still, they are very handsome birds. If I was going to seriously get back into Delawares, I would slowly let my others go and do only Dels due to the challenging nature of breeding a proper Delaware.
I have no interest in Marans, personally. They can't be great layers and have fabulous egg color at the same time, plus, I just don't like the looks of them, but that's just me.
You know me, I love my Barred and Blue Rocks, but I also love my BBS Ameraucanas--very sweet, personable, friendly and when they aren't in molt, fabulous layers.