Mixed Shimano compatibility checks

n3crophile
n3crophile Posts: 52
edited May 2014 in Road buying advice
Hi all,

Wanted to run these by you and see if there are any compatibility errors or any specific rear mech that I need:

F Brake: old Shimano 105 (maybe 5700 but probably earlier)
R Brake: same as above
Cranks: 105 5700 53/39
F Mech: 7800 Dura-Ace 10 speed
Cassette: 105 10 speed
R Mech: - it's an old 105 at the moment. I'm trying to find a 7800 Dura-Ace to semi complete that aspect of the build, but would any 10 speed work?
Chain: cheap shimano 10 speed

I read something about pre-5700 mechs working with 7800 Dura-Ace but then 5700 and onwards utilising a different pull ratio. Any advice would be grand! Also, where on the brakes would it say the spec number?