Nuckin Futz here has both, maybe he can quickly describe the differences to you.
Personally I can't recommend them enough, I really love the GR07...I think you'd love them. I also liked the Phonaks (tops to Sonny for lending them), thought they had a similar sig just didn't extend quite as far. As far as your wallet goes, you could always sell the 06 on, they're in short supply!
To be honest if you like the dynamic sound of earphones then in the price range the GR07 will be the IEM you will have to get mainly because the BAs in the price range that may even be classed as better will, probably have to lean a bass and just a different sound in general so for that reason i think the GR07s are the way to go.
Yes the Phonak tips are great on them right, i think they are even better on the GR06s actually. Just shame they keep falling of in your ear hey :L