Welcome to SOF!
No doubt you're excited to pick up your '14 RS. A few owners might add an amp and sub or change out the door speakers but I don't think many have changed out the stock MyLink head unit.
I'm very much into high end home audio and at one time did the same in my cars, but not for many years. I actually like the sound of the Stock MyLink system and have not yet felt a desire to change any component. However I do think the 3 band EQ needs adjustment to get the best sound, which for me means lowering the bass slider several notches and raising the treble several, mid can hover near '0', otherwise the default sounds boomy in the bass and lacking detail in the treble.
Each music source will require different adjustment and can be saved for each source.
As already mentioned, many vehicle setting are done in Mylink so it'd be a risk to change it out.