My buddies 91 300D 2.5 Turbo has gone the way of the dinosaur... she broke her oil pump chain and seized

.
So now she needs a rebuild (if we don't decide to go w/ a new engine for the warranty). And I (at least) am of the mind that if we have to rebuild it anyway, why don't we make it
better than it was?
What I want to know is what is available out there for performance diesel parts and what would I need? I would want to find better pistons, tougher valves, race cam/crank, tougher head gasket, intercooler etc.... so that I could kick the boost up over twenty after I tear the freakin boost control out

(obvioulsy I will put in another boost control system). Where can I get performance diesel parts?
My first thought was to bore it out, but I think that beefing up her guts and cranking the boost might give me better power for less $$.
Or should I beef it up and bore it out to, like, 3.0l??
I just can't see the point in all the effort involved in beating out the old pistons, redoing the valves, honing the cylinders, etc w/o kicking it up a notch!
I want to hear opinions and parts sources....leave one or both!!!
-Matt-