I can only talk about the knives that I have experience with, so here it goes:
Tojiro ITK: Don't. Poor finish, the handle has a very poor finish, I have a few knives from that series that I bought just to get some experience with Carbon steel and it was the same with all of them. Ugly handle and low quality assembly. I gave them some sandpaper love and then a few coats of tru oil and it became acceptable.
They don't get a patina... They get kinda rusty and an ugly stained pattern. The "Kuruochi" coating (the black on the blade) falls very easily when whashed with the green sponge, it's just too thin and if you want to keep it, you need to use a soft sponge to clean it, otherwise it's going to get scratched very fast, and since I'm an "scrub it hard" freak, I got mines totally kurouchi-less in a matter of days...And you guessed it right... I got the ugly patina...How ugly?... I got a tetanus vaccine just based on the fear of cutting myself with that rusty and dirty looking blade.
I clean them with a very abrasive black sponge just to get rid of the stains
On the other hand, the gyuto feels thick, and actually it is, when cutting a carrot you get the feeling that you're breaking it apart. Like an "axe effect" (To name it some way).
The pros... Takes a good edge and keeps it for a while.
That knife is a big no-no for me, but I don't regret on having it, I got some experience with carbon, and the funny thing is that the "Nakiri" from that same ITK line, is one of my favorite knives, I got two and that's the knive that I use in the restaurant to carve the laquered duck. It has a great feeling, takes a very nice edge (I sharpen it only to 1200 grit because I use it only for the duck and I've seen that the "gritty" edge works awesome on the crispy skin and gives a "micro serrated" kind of feeling) but also takes the 6000-8000 polishing very well.
But since we're talking about the gyuto, don't listen to me on the nakiri.
Forchner: A real battlehorse, far from being a Japanese high end knife but a tool that does the job very well. Affordable, durable and time proven.
Richmond: I have no experience, but Mark from CKTG is a very stand up guy and if he's endorsing it, I trust the man. It has to be good, but again...Zero experience with it.
My two cents.