The first part of your post is a thanks post. While we appreciate you want to be polite, please use a PM to thank someone. It helps to avoid thread clutter.
As to your question about haste, there is no haste cap for rogues.
Alright, that's pretty useful to know, I'll have to moniter which bosses have a 'rollover' for rupture. The next thing I was wondering was what's the haste cap? Or is it always going to be good to get more haste when Exp and hit are capped? (yellow hit)