If you end up using a Classic valve set up there is no benefit to using higher pressure. If you use an RT / X type valve you will have a more reactive trigger with higher pressure, look up some youtube videos on the Automag RT and you will see what I am talking about. I have been watching this thread for a couple of days and there is a lot of good feedback. Just keep in mind that Automags in general are very versatile and most parts can be interchanged at will. Most people look at an Automag as the some of its various parts...Body,Rail,Trigger Frame,valve,Barrel etc. It is for this reason that most of us have multiple mags because if you have just a couple of these parts you have the start of a new and different Mag with the main part being the Valve. Automags are like rabbits and tend to multiply very quickly. If you are looking to have just one Mag and not get Mag fever so to speak I suggest looking at all the different options for the different parts needed to build one and piece it together to your liking. As stated above look at the picture thread or the Mag Of the Month (MOTM) thread to get an idea of all the different and awesome builds that have been done over the years.