I believe the best grinder to use is a burr grinder.  They are more expensive, but if you are serious about getting a consistantly good cup of coffee, than you need a burr grinder.  Don't use a blade chopping style of 'grinder'.  This is not grinding your coffee, it is blending it up.  A burr grinder grinds your coffee to a certain size that you decide (i.e. fine, course, turkish).  A blade style chops it up for an unknown length of time until it 'looks' right.  Take the guess out of it and get a setting controlled burr grinder.  Be prepared to spend $50 or more on a good burr grinder.  And for the sake of all that's holy, don't grind your coffee days, hours or even minutes before you intend to use it.  Do it when your ready to brew!  Please, for the love of coffee!!