Most any fastener house will stock B7 high strength threaded rod. The actual spec is ASTM A193 B7. Typically made from heat treated 4140 steel. Same strength level as high strength bolts for structural steel which are typically graded differently than the more familiar Grade 2, 5, and 8 bolts used for most applications. High strength structural bolting material is normally used with load indicating washers which give a visual indication of adequate tightening. Not cheap, and likely overkill for the application.
For indoor use, the zinc coated wedge anchors are fine. If you look at the price of the galvanized anchors, roughly 3X the price of zinc, that's an indication of how rarely they're used rather than an indication of the cost of manufacture. Unless you're in a coastal area or some other situation with agressive corrosion, the SS anchors are a waste of money. FWIW, probably 95% of structural steel anchor bolts placed in the forms prior to pouring concrete are unplated steel, and they hold up fine in interior use.
I've used thousands of the plated ITW Red Head wedge type anchors for hanging steel pipe from overhead concrete structures. Never had a failure, and have been back years later for servicing equipment and have never seen any indication of rusting. The supply house I used stocked both Red Head and Powers/Rawl brands but my personal preference was Red Head.
Maintaining the hole size is important, and that won't happen with dull drills. Use good masonry drills which look like a twist drill. Avoid those hardware store plated things that have a body with something similar to screw threads. They don't hold up at all. Use a little rubber bulb with plastic tube for blowing the dust out of the hole. It is made for that purpose. Blowing with compressed air is pretty much guaranteed to eventually fill your eyes with dust at some point even with safety glasses and/or a face shield.
Added: In 15 years of spending an average of 4 days a week on construction sites, I saw a lot of Hilti drills and demo hammers used because they're the most durable ones on the market. But I never saw anyone using Hilti anchors on any regular basis for the simple reason that they're too expensive as compared to other quality brands.
The Hilti model is similar to Snap On. A product starts out with a high price, and then the guy riding around in the van adds another 40%. It works on cost plus jobs where the contractor makes more money by spending more, but it just doesn't fly on fixed price contract work.
