yes, i thinked of RAID 5 but my problem is the next one, ive no fear of one disk failing. My fear is if i have to move my array by force, not by will. If something happens to my motherboad im screwed. I´m in Argentina so not everybody has decent computers here, is not like i can go to a friend´s house and use my array in his pc, it´s possible that if he is not a computer fan like me he will not even know what sata is. So if I have an array and I have a perfect image of the entire disk in a single drive, i can use my array for performance and the single drive is a daily image backup in case my motherboard dies and i have to replace it with another one wich is not compatible.
I can use HD imaging software to duplicate my entire array to a larger disk but i´ll have to program it to do it every night, it will only take one hour at worst but if it could be done live while im in the pc it will be best.
So, finishing, i will use my array (160*2) and i will buy a 300GB HD, i´ll create a partition of 270GB to store my things and another partition with the rest of the space for windows, apps and games. I will setup an imaging software to make and exact copy of the 270GB partition to the 300GB HD every midnight (i can use the bios to startup my pc and sotware to shut it down after automaticly) so ill have a backup, and ill have the performance of RAID 0 with the security of RAID 1 and if i need to change PC i can destroy the array, put it in another one and recover the things from the other disk.
Thats my way, Im open to suggestions. And thanks to you all of you for trying to help.