For anything other than espresso, a modestly price grinder is adequate. Although there is some disagreement here about using an inexpensive grinder, I am of the feeling that although a more expensive grinder is best...one can get by with an inexpensive one for all production methods except espresso.
Since I think I am the "some," (grin) I'll just throw out my view.
1. I agree with Shrink that a high end grinder is necessary only for espresso.
2. For automatic drip, nearly anything with decent burrs that is not junk will work.
3. I think where Shrink and I disagree slightly (and respectfully) is that what I will call "higher end" pour over and the like (Chemex, AP, vac brewer, etc.) benefits from a grinder that can be between #1 and #2 in quality (and cost). FP, not so much. Same grinder as #2 is fine.
I drink (well, I used to drink) a fair amount of Chemex, AP and vac brewer and I am absolutely convinced that something like a Mazzer Mini benefits those coffees as opposed to a grinder described in #2 above. With a FP or automatic drip machine, very precise and highly consistent particle size is not so much an issue. With Chemex, AP, etc., I think it is.
But, all of us agree (I think) on the importance of the grinder. Everything else being equal, most of us can pull a (much) better shot with a $200 espresso machine and an $800 grinder than with a $20 grinder and $7000 espresso machine.
Take a look at the Rocky. Highly regarded entry level for both bucket #1 and bucket #3.