This where its all happening mate
Theres no going back to the darkside now
Judging by your broad requirements I would say theres a lot to choose from in 531 alone with your size being maybe, as mentioned, the slighty harder thing to find. Theres still loads of large frames out there as every time I look at an ad, they are always too big
I'll definately keep my eye out for one and drop you a line if I do come across anything.
Good hunting my friend.
Carlsberg dont build Singlespeeds but if they did.......they would probably look just like mine.
I've spent half my life on bikes.........the other half I wasted