With customs fees, etc...I ended up paying $1600+ for my #1 HG - a brand new Rouge Theatre City. In my opinion, it was worth every penny. It is gorgeous and I love it.
On the other hand, I also got a brand new Anthra city (another HG) for a little less then retail!
I don't really have a "limit", but I only buy bags in brand new condition, so HG or not, I wouldn't pay big bucks for a bag with dirty handles, scuffed corners, etc...