The simple answer is, consistent grind size matters.
I inevitably get asked by friends when they see me making “fancy coffee”, “Hey, how much is it and what do I need to make good pour over coffee?” I rattle off a few types of pour over drippers, which ones I prefer and why, and then move onto kettles and how a good gooseneck kettle can really make pour overs so much better / easier. I try to not forget to mention the importance of getting some good whole bean coffee, talk about the merits of weighing versus measuring and then ... move onto grinders, where people usually grow wide eyed at the price. The reality is you can have a pretty good pour over experience without much muss or fuss and it does not have to get terribly expensive. What typically gets overlooked in that experience though is grinders, because they are by far the most expensive (but arguably most important) piece of equipment. Most people say they already have a grinder, and commence pulling out their family’s blade grinder and go to work making their coffee. Now, don't get me wrong, a decent cup of coffee can be had using a blade grinder (especially if you are using a french press) but it's one more variable that can drastically affect your cup. Let's go back to my answer... Consistent grind size matters because different brewing methods need different grind sizes and the consistency of that grind size will create a better, more consistent cup of coffee. Not having the ability to consistently grind coffee just adds one more variable to the process, with the result increasingly going to chance and thus increasing the odds of creating a less than stellar cup of coffee.
So, what are the options? Burr grinders are the defacto standard and they come in a variety of flavors but there are really just a few types. These types are conical (cone shaped), flat plate, electric and manual. Many people are drawn in by the cost of manual burr grinders but the time involved and sometimes less consistent grind size at the larger end is a turn off. There are also some fairly cheap name brand burr grinders on the market but they tend to be lower quality and people complain about finer grind sizes. The $90 to $140 range seems to be the sweet spot for pretty good entry level home burr grinders where Capresso and Baratza, among others, have options. Don't feel like you need to jump head first into the land of hundred dollar grinders just to make coffee at home but it is one piece of equipment that can drastically improve your coffee experience and consistent taste of your coffee.