So the standard Pegasus extruder is that good? Or do you have specific concerns with the Titan? Also, dual extruder, handy or not worth the trouble?

Will definitely be going with the full e3d-v6 hotend. And 1.75mm.

Yeah I may not go with the nylon. PETG looks pretty good, and we'll also probably use some of the PLA/PHA hybrids. Woodfill and possibly the ceramic also, although I'm not sure if the e3d-v6 will get that hot. If not, we just won't use it.