Great advice from Holdfast.
It really depends how tall you are. 1.5" seems to be the standard, with 1.75" as an option for a deep cuff. But for someone with long legs, 1.5" looks insignificant, almost an afterthought.
I'm pretty tall, and I always used to go for 1.75" cuffs. However, I've decided that 2" looks much better. I can't imagine going any further, even for someone very tall.