Dorian is cheaper than Aloris. Phase 2 is import stuff, I don’t know that one import is better than another. Make sure you get a wedge style as opposed to the piston style. The last holders I bought came from cdcotools.com, but you’ll be getting some when you buy the tool post set.
If you don’t have a bunch of HSS or cemented carbide bits already, you may just want to go with carbide inserted for the tools and the boring bar latheinserts.com has both.
Drill the majority 80%+ of that pulley out and then bore the remainder.