There seem to be a lot of replies in favor of P5 and many for ProPack. I bought P5 when it was first out and have never been able to use it because of all the problems. It may be fixed now but in the meantime I also bought ProPack and decided I will write off the $175 for P5. I like the ProPack software. I think you have to make sure you have the latest patches regardless of which one you choose. So I guess my answer is to go with the ProPack. Maybe P5 would work good on your system but I think a lot of us who bought it in September are just tired of trying to make things happen that won't.