Thanks guys! I look forward to seeing more suggestions -- for both call names and/or reg. names. They don't have to go together, by the way... though it's always nice when they do!
Sizzle, Edge was one I'd thought of, but no one else really likes it unfortunately.
I liked Gage and Rogan... but the breeder has already had dogs by those names apparently, and likes to try to stay away from repeats.
We (breeder and I) have come up with a short list of possible reg. names, but I'm not sure how much I like any of them:
What a G'rip
Get a G'rip
What a T'rip
Tear it up
And I think there were a few others, but I can't remember them at the moment.