I've found mofi cd quality is quite variable. You never know whether the extra $ will yield better sound quality or not. At this point, I've become rather cynical about the brand.
Although I can't afford gear at the level of ARC, what I've concluded is that many Redbook cds have the potential to sound great -- it starts with a high quality transport.
Maybe ask @ghdprentice -- he's very familiar with ARC.