Great solutions! I think all of you are right... I will try to build my own library of highs...I always were looking for the adecuate sounds just editing conventional samples or aplying too many effects, but this time i will records the sounds of the real world ( i need a new quality mic...) and i'll seek into the libraries that have many real sounds and then edit or apply the fx...
Reverse sampling could be a good idea too!
Thanks to all, you have just refreshed some ideas that were facing me this time...