So it's about that time for me to start looking into the next big studio upgrade. I want a great preamp (mainly for vocals and distorted guitar) and a distressor. but how much difference does a great preamp really make? Right now I have the pres in my allen and heath mixer and an ART tube PAC. They sound pretty good but my mixes always lack that little professional something. It's that like undefinable extra sheen/thickness/something that I can't really describe. How much of that is pres as opposed to me just sucking at mixing? edit: and in addition to that, which will give me the biggest benefit? A great preamp, or getting the distressor and using that with my current pres?