if you're ever going to use your car during the winter, check out:http://www.gewindefahrwerke.de/e_version/salzspruehnebeltest/info.php
KW offers their VARIANT 2 kit for the celica. this features 25-60mm drop up front and 30-65mm drop on the rear. you can also adjust the rebound of the shocks!
a friend of mine has the variant 2 on his audi S2 sedan (was tuned to 380hp, now building 500hp, using it for track days etc) and it works great, and takes a hell of a beating.
oh, and if you check the english/american version of their homepage you won't find the celica listed in their program. but they have it. it's listed on the german version of the page, and it's listed in some catalogs.