I guess because it's been a few years since I spent any trigger time with one, but I can't believe I forgot a great design that would probably meet your requirements: A SIG (P229,P226) with the DAK (Double Action-Kellerman) trigger. I really liked the 229 I shot with the DAK trigger: Around six-pound pull, no stacking, decent reset. Also a double-strike capability. I never put a trigger gauge on the one I shot, but most published data I've seen lists a trigger pull of 5.5 to 6.5 pounds.