Thank you all for your advice!
Still not 100% sure on which wheel to buy first, when I google it many seem to say that a 8" wheel is the wheel they use the most and then a 4" wheel.
I have access to some SS 2140 steel..which is similar to uddeholm's ARNE and apparently O1.
I am not sure if it would make a good razor though, any thoughts? And I can always buy steel from other sources outside Sweden, I have bought steel from NJ Steel Baron before.
I've seen alot of different high carbon and tool steels beeing used for razors, such as 1095, O1 and D2, do you guys have any recommendations? The heat treatment will be outsourced so I can work with almost any steel.