Well I guess I'm going to play X-2 first once I finish XII, I've heard all the things people don't like about it but I might not mind it too much. After that I'll just do them in order, V-IX..
Make sure you take your time, and remove all lethal weapons, or anything sharp while playing such a terrible game as X-2, because it leads to instant suicide or insanity, or you might just turn into a hater of the piece of crap.