i already tried when i wrote the post, but since i still don't know "WELL" all the tekkit mods, i wouldn't be able to recognize conflicts or, worse, it would be possible that i experience problems later on, ruining everything i made combining ic with the new things.
anyway i'm pretty sure that after 1-2 hours of wikiing around i'd leave ic2 into the past (with a tear D': D':)