DEF. get it repaired. i tore mine 2 months ago, and had it reconstructed 1 month ago. while i could stay fairly active without it, theres no way id have been able to ski, at least not how i want to. i had an allograph, where the ACL is reconstructed from a cadever hampstring, and while i was hesitant at first, im glad i went that way. its been 1 month, and i could limp without crutches 4 days after surgery, and youd never know i had it now. yes, my ACL hasnt grafted yet, but i am able to get around and be fairly active. its a roughly 6-7 month recovery time to almost 100% strength, so ill be good to go by ski season. id reccomend doing it asap, even if you miss a month or two of the season, do it, youll fuck yourself up even worse without it, and itll most likely be the kind of thing thats either unrepairable or years of recovery to regain.
if your worried about getting back on your feet asap after surgery, allographs are the way to go, since theres no big cuts to heal, etc etc, autographs (hampstring or petela) take ALOT longer to recover from, at least before your back on your feet (think months instead of days), but petela graphs get thier full strength back a bit sooner, but not enough to let it be the deciding factor (im ny opinion). also, BIG downfall is your taking material away from other areas of your knee to fix another.
either way man, it sucks, but its honestly not too bad. as long as you just do what your supposed to, and take it easy, you can DEFINATLY be back in the game next winter. no ACL and a brace is not a solid substitute for a functioning ACL.