Hello there, Tiffanyl.
I haven't played the stage hats, but from what I see and hear on the Sabian-webpages, they're not very different from the HHX groove-hats. I have played my 13" groove-hats for almost 3 years, and I just love them. This is mostly about personal taste, but I find all HHX- stuff that I have tried to be very sweet. They project extremely well, so theire sounds won't get lost in the mix. They have a little nasty bite to them that make them quite unique sounding.
The HHX evolution is also a really nice pair of hats.
If you have the chance to try them in person in a store, it is the best. But you can check out the soundfiles on Sabian( which you probably already have done) and also Dom Famularos web page
http://www.domfamularo.com/ He plays the HHX Stage hats.
Good luck.