I cut similar places Rafafredd, but not exactly where you suggested. My console is normally -75db to -80db with no inserts. I think -70db is fairly respectable and i've heard from people who used the originals that they aren't really that quiet to begin with, that what I am seeing is average. However, each person's results will vary with all the variables between systems.
Matthias: Are you talking about normal usage? When my faders are @unity you cannot hear the GSSLs at all. I meant to say that the 60hz hum is only audible when you turn the gain on the box and the console up enough to hear it.