The Proraso is great stuff, been using it for two weeks now and love it. I do the same as Gairdner with the Alum though, the skin on my face hates it and it makes me itch like mad even though I rinse it off after a few minutes. Makes a great deoderant/anti-perspirant though. A lot of people like it and you will just have to see if you get on with it. Arko cream is also fantastic IMO, not quite sure on the witchhazel yet and never tried the Astral. If you wanted to try another that is very cheap, easy to find and does wonders for dry/sore skin get yourself some Sudocreme from chemist or in the babies/nappy section in a supermarket. Big tub that lasts for years for a few quid and is really good to the skin after a bad shave.
My normal routine over the last couple of weeks is the Proraso pre and post (less is more where post shave is concerned!)
Let it sink in for a few minutes then apply sudocreme, again less is more or you end up looking like a ghost.
Again let it soak into the skin for a wee while then some AS like Barbershop Bay Rum or Speick.
Don't apply cologne to the face, AS is ok but not cologne. I never realised before joining here that there is a difference between clogne, EDT, and AS. I thought they were all different names for the same thing. There is a write-up somewhere on the differences and when/where they should be applied
And as for it being cheaper? Well it most certainly is! If you can stick to one razor, one soap, one AS, one pack of blades. But nobody ever does and I am quite happy that I don't