No two shops are the same. Some folks want three high end grinders and a basic drill press, others want three mills and only a basic grinder, and others will have a forge, hammers, anvils, files and stones. Different people operate different ways, and that is part of the fun of it. It blows my mind how many different approaches there are.
I recommend you make a knife or two with simple tools and figure out how you want to go about making knives. Files, hacksaw, drill and sandpaper are all you really need to start. A person could make a fine basic knife in one day with just those tools (minus HT).
As far as a real knife grinder goes, if you are handy and can setup your own with a surplus motor and base, you can get one of the better grinders on the market, the KMG, for a little over a grand. Paul Bos and Peter's HT and others can do your HT, but otherwise an inexpensive HT oven is about a grand. A small drill press and a metal cutting bandsaw are a few hundred each. The rest of the piddly stuff would probably add up to less than a grand and you'd have a good solid basic setup.
If you're into folders, a basic mill, lathe and surface grinder will help and will set you back another 2-4 grand.
All told, you could spend 10K on a "professional" level knifemaker's shop without too much trouble (I know somebody with a six figure shop), but before you get to that point you'd develop some pretty specific preferences of your own.
