Replying to NEW SKIS!?! TOMORO. HELP!!!

I went into the shop today for new bindings at their season opening sale (where they clear any of last years left overs at like half price). I own 720'S, but while I was inside I fell in love with the new '03 silver teneighty (with SPACEFRAME shit). It is so light wieght, and so flexible, but with extra support in the tail. Its $625 (regular $750). I just got my 720's last season for $330, and my parents were expecting me to use those for years to come. But now i'm considering selling my 720's and their old bindings, and purchasing the new 1080's. Is it worth it? sale ends tomoro! I think that after selling my skis, the new teneighties would only come out costing me around $250. HELP!?!