Thanks for all the replies. I ended up just using the Power and Sample Size for One-Way ANOVA tool from Mini-Tab. I entered a standard deviation, Power value and maximum difference b/t the means, and then MiniTab calculated the sample size.
The sample size necessarry to estimate the variation of the individual values is tied to the standard deviation and not the mean...the sample size for good estimates of the standard deviation are larger than those for the mean... if you are submitting data for a regulated industry such as pharma or medical devices (which are the industries that typically reference IQ, OQ PQ for 'special process' validation) a good reviewer will question this choice.