i'm thinking of getting pro action replay soon. but i'm too afraid that it will corrupt or destroy my saved games. i beat them all but i need some extra fun on the other games. and 2 games that i need to beat cause it is driving me nuts

make copies of your saved games, just in case. That's what I do, and I don't use cheats. It's just a precautionary measure, my GTA3 save file has fucked up on more than one occasion.