We all agree that using mix bus compression is a good idea although we caution against extreme compress in that it might leave the mastering engineer no options. You might consider making a mix pass that is uncompressed if you have any concern of this nature. Mix buss compressor examples vary between us but you could try a Neve 33609, Tube Tech SMC2A, GML 8900, SSL buss compressor, Manley Vari Mu and digitally many of us use a TC 6000. For comparison sake you could give a peak limited version of the mix using something like the Wave L2,3.
Some of us use EQ on the mix buss. Equalizers you might consider are the GML 8200, Avalon, Millennia and NTI.
We use the following converters: TC 6000, Apogee 16x, Euphonics, DB Blue, and Mytech.