Do the High PS hose. I replaced mine with Gates. I heard Rein is good to. Otherwise OEM if you loaded $$$. I'm all for OEM everything 99% of the time. But I opted for cheaper and its been working good so far with my hydro assist setup.
Do all PS hoses while its easy now! See my Crawler80 build thread for my PS cooler set up with the derale and PSC resv. I wish I did that for my Turbo80. Thats the only thing I neglected to do on my Turbo80. High pressure and Derale and PSC resv. I will one day.
Otherwise def do the engine isolator. It's much easier right now with no head in the way.