Well, most of my amateur-research (read: internet nerd) is usually about pythons and boas, but I'm trying to find some big colubrids out there. Not the longest, but which ones get generally big. Like, a good mix of both long and girthy/heavy. For what it's worth, I'd prefer Central American, South America, and Asian colubrids. I do know about cribos and indigos, but they're not my things. Tiger rats (Spilotes sp.) do get fairly long, but they're also rather thin.