man you honestly wont notice shit...the heavier the ski, the more stable it is...as Ics_is_Crazy said, you wont notice shit difference between those skis, and maybe a couple ounces at the most..
if it still bothers you, work on your quad muscles and all will be good - otherwise if you go for the lightest ski out there, yeah you can spin better and shit, but you will be forgoing stability..