OK...I lied!
Here goes...
First, Full Disclosure.. I am a certifiably insane coffee freak. You have been warned…
And now, a few thousand well chosen words on the topic of grinders:
Of the three elements in making coffee the high quality, freshly roasted beans are, of course, the most important element. The least important element is the production method. Whether you are making press, pour over, drip, or espresso… the device you use is far less important than the grinder.
The qualities to look for in any grinder - expensive or inexpensive, manual
or electric - is the uniformity of particle size and, secondarily, retention, build materials, and ease of cleaning.
Particle size is the most important element in that having uniform particle sizes, no matter what your extraction method, allows for maximal extraction for the best coffee production. If there is very high variability in particle size, i.e. a mixture of large particles ("boulders"), proper size particles, and dust you will get poor and inconsistent extraction from your good beans and very variable tasting coffee each time you make it. Whether you're making espresso using a very fine grind (particle size of about 250 microns), or press using a coarse grind (particle size of around 1000-1200 microns) you want all the particles to be as close to the same size as possible to maximize the extraction and get the best possible coffee out of your beans.
Retention is only important insofar as it easier when you measure your whole beans going in you know how much to allow for the loss of grinds in the grinder. So if you know that your grinder has a consistent 10% retention you can always make a predictable compensation when weighing your whole beans.
Such issues as build materials and ease of cleaning generally are correlated with the cost of the grinder.
Having said all that, one's budget now enters equation. When it comes to the equipment necessary to make coffee, I would always recommend spending as much as you can manage, within your budget, to buy the best grinder possible. Again, aside from fresh high-quality beans, nothing is more important in the production of coffee tha
n the grinder.
Please feel free to totally ignore the above as it was written by a lonely old man who has nothing better to do to torture the innocent. 
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And to
@SandboxGeneral...see, perfectly reasonable, controlled, and practical.
