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You need a bit better definition before going out and forking out a bunch of dough.
I did a bit of random clicking on Dell's website, and was able to spec out a Dell Precision computer for just over $10 Grand. 
Here is a nice quad core + 8GB RAM for about $400 locally.http://eugene.craigslist.org/sys/4121984137.htmlThis one has dual monitors + 8GB RAM also for $400.http://portland.craigslist.org/mlt/sys/4145583608.html
Keep in mind that anything you buy this week will be obsolete next week.
You may find yourself wanting to add memory or something.
I now have one of those little half sized desktops. Many people never mess with cards and etc, so the smaller form factor is fine, but for the one-percenters, it is handy to have a little expansion space.
How much of the tutoring will be on a computer vs working with books and paper? 3D graphics vs reading word processing docs and spreadsheets?
Personally I've mostly converted over to Linux with Open Office or Libre Office, & the Eclipse programming platform.
However, some of the Microsoft Visual Studio programming platforms just about program themselves... at least it would be worth considering if you're doing any programming in the educational environment.
If you set up a network, Ö
As far as dual monitors, I guess it all depends on what you're doing.MultitaskingIn a sense, you can window from one window to another using Alt-Tab. But, sometimes it is nice to have extra windows. Put mail, schedules, websites in one, documents in another
Actually, I like the idea of the new ultrawide 29" monitor which should give more space for side-by-side windows, although in a sense, it looks like a 30" monitor that has the top cut off, so perhaps one is just better off with the 30. But, the little extra width could come in handy.
I haven't tried using a HDTV as a monitor. 1080p is supposed to be 1920 x 1080 pixels. This is the same resolution you might get on a 22" monitor.That means that for a 60" monitor, you get about 3x the pixel size in each direction. I believe there are cases where it would be handy, but it certainly isn't equivalent to having a half dozen computer monitors smashed together.It would be great, however, if you wish to do powerpoint presentations to small groups of students.
Your BB computer comes with a keyboard and a mouse. Do you need the extra ones?
I suppose some people like wireless, but for me, it just seems excessive.
Those are expensive speakers. It is hard for me to imagine "business use" would require speakers worth more than $20.
3TB??? It is mainly commercial videos that eat up a lot of space. Unless, perhaps you are also doing your own video editing (see below).
You might also consider a USB Hard Drive for backups, especially important the more "business" data you keep on your PC. It should be as big or bigger than what you have for the hard drive on your main PC. You may also consider NAS.
I've got a color laser which I like, although I must admit that the color quality is mediocre. You will have to decide if you wish to use color vs BW. The color ink jet printers are good for many things, but it is also hard to beat the quality of a good BW laser.
Also, one should consider the use of multifunction machines vs flatbed scanners, as well as how much scanning you will actually need to be doing.
I'm not partial to brand names for things like monitors. BB has a Hanns-G 27" monitor for $100 less than the Samsung. I've never used the 27" monitors, but the number of pixels is identical to smaller monitors. But, the prices are now competitive.
Is your goal including video production & video tutorials?
Video Editing Software?
Once you get an approximate budget and idea of what you want, it never hurts to actually go to the store and look around.