I am located in Australia so I have very little chance of picking up any used chisels especially locally.

What to get?
1 ½” Framing Chisel - a must
1” timber framing mortise chisel
Corner chisel 3/4 to 1 inch wide (optional)

Slicks optional? What size 2 to 3 1/2” wide 27 to 35 inches long overall

Brands?

Barr Framing Chisel
https://barrtools.com/product-category/framing-bench-chisels/
Popular amongst the time framing community

Auntine
http://johnneeman.com/en/tools/chisels Auntine
9HF high carbon steel 64-65 (HRC) getting right up there maybe too brittle. This is getting up there in hardness, is it going to be like a japanese steel maybe a little to glass like for a ham fisted newbie. If you ever worked with Australian hard word Janka ratings up to go from about 7 up to 15.

https://www.timbertools.com/Chisels/ Buffalo Tool Forge
Looks like a copy of the barr framing chisels

KharkivForge small custom forge 52100 steel HRC 60-61
https://www.etsy.com/au/listing/665...hisels?ref=shop_home_active_15&pro=1
https://www.etsy.com/au/listing/668643405/set-of-five-big-chisels-with-beveled?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=chisel+timber+framing&ref=sc_gallery-1-15&plkey=d32443523fcaede069b3b7cd6fa3409d0d619b67%3A668643405&pro=1&frs=1
https://www.etsy.com/au/listing/679...chisel?ref=shop_home_active_10&pro=1

Obviously Barr appears to the go to, timber tools seems on par, auntie john neeman seems to be well liked as well. Kharkiv have a few reviews all the products sold look goods and are made from decent steel.

Price, well importing to Australia means freight, to give you an US based users an idea I purchased the paper based timber framing book from the guild and the shipping was more expensive the the book! So Price wise they will all come in pretty close

I will probably buy a Veritas MkII Honing System again (I owned one decades ago)