My recommendation would be to find a local knife maker who already has some (or all) of these tools and see if you can't stop by his shop for an hour or two and try a couple of them out. Granted, they may have a 2x72 instead of a 1x30, but you'll still be able to get a good idea of the difference between a flat platen, contact wheel, disc grinder, etc...
Like Stacy said, fill out your profile and tell us where you're at. If you're anywhere close to NW Indiana, I'd say come on by.
Also, FWIW, there are a number of 2x72 options out there for less than $2k, and many of them can be added onto with more fixtures, tools arms, accessories, etc... in the future as needs and funds allow. Not sure what kind of tools you have access to, or how handy you are just yet, but you could always save a few bucks initially by building your own, or getting a "kit grinder" that you put together yourself. Depending on where you get it from, it may require welding, or some basic drilling and tapping, but it's usually a more inexpensive option. I'd also keep an eye on the local "classifieds" (eBay, facebook, craigslist, etc...) and you may just find somebody getting rid of one for cheap. You may have to drive 3 or 4 hours, but.....
The nice thing about a lot of these tools we use, is that even if you ultimately decide you don't like knife making as much as you thought you would, they can be used for loads of other things.
Or you can probably put them right back up for sale and get most or all of your money back. Either way, you picked a good time to get into knife making. There's never been more tools, options, or information available as there is right now.