I have the R7 - which i really like- and the 8 and 9.
If what u dont like about the 7 is the shutter lag, try using s soft release on it. It makes it way better.
The 8 is superb. Really big but once you use it you realize how good the ergos are. Ones with a lot of miles on them can scratch film as there is a film guide inside the door that wears down. I fixed mine by covering it with a small piece of sellotape that made it smooth again.