While iPod sales continue to remain strong, Banc of America Securities analyst Keith Bachman said on Tuesday that Apple’s Power Mac G5 sales could turn out disappointing for the second quarter in a row. “We believe [G5 sales are] the single-best gauge of the growth potential of Apple,” Bachman said in a research note. “The G5 is more important that the iPod in terms of (earnings per share) impact.” For its fiscal first quarter ended Dec. 27, Apple shipped 206,000 G5s, falling short of analysts’ estimates. Bachman estimates that Apple will ship 195,000 G5s in its current quarter.