Bodum's C-Mill Grinder will automatically improve your coffee if you're not using freshly ground beans. Further good news is that if you're using a plunger, or espresso machine under $500, then the very affordable Bodum C-Mill is as much grinder as you'll need for optimum coffee satisfaction.
It's long lasting and low maintenance. C-Mill's sharp stainless steel blades will quickly process 45grams of beans, and it has a two year guarantee.