@Antisocial: You really answered your own question. If you want something done right, and no one else can do it for you, then simply learn to do it yourself.
Trust me when I tell you I know exactly the "sound" your looking for. Hell, my favourite mixes are Hellhammer's Apocalyptic Raids and Celtic Frost's Morbid Tales.
As for the "modern metal" sound, I agree w/ you a 100%. It sounds generic and way too sterile, especially the drums.
Guitarguru777 gave you some really good advice. Get a Marshall JCM 800, and put a tube screamer in front of it. As for a cab, get an older Marshall 4X12.
As for finding an engineer to do an 80s sounding job, why bother? It would make so much more sense to just learn to record the stuff yourself and get the exact sound you want rather wasting yr money and time trying to get something that no one really wants to give you.
Also worth considering is this, modern production/mixes are geared towards cds/mp3s/digital everything, whereas 80s stuff was produced and mixed for vinyl. Now if I remember correctly, analog tape was supposed to roll off some of the low end or something like that. So that's something to consider as well.