Sean, I have a 1520 which is the wooden handled version of the 620. After breaking it in I have found that while it has softened some it still has kept it's backbone and is a great facelatherer. It facelathers my creams really well too. I would go with the 620. 830 will end up being a little floppy and soft like a 1305, which I also own. It's a great brush, just not a super facelatherer once it's broke in.
Clayton
Clayton