A blade grinder like that won't do a terribly good job for something like an AeroPress. Grind quality is one of the most overlooked aspects of good coffee.
You really need a decent conical burr grinder to get a consistent fine grind. I like my Capresso grinder that I picked up for something like $70, but a quick googling turns up several well-reviewed burr grinders in the $30 range.
