I guess I like making old stuff as good as new!
What does your 6910 need done, and where are you?
I have replaced the collar, steam thermoblock, thermal fuse and magnetic water level sensor on mine, as well as some group head seals.
10,000 shots pulled from it, and my coffee taste buds might not be very "tuned in" but I think the flat whites I make compare well, with most that I buy from cafes.
Not from experience, but from reading on here, a 7000 is more of the same, some say not as good as a 6910, and a similar speced Breville is likely to be the same.
So if you want a jump in quality I think you are going to have spend quite a bit more.
Have a search on here, there are some good recommendations by those who know about this.