Here are a few tidbits I can offer you about the VM. Stay away from the maximizer kit, back in the day it was great but quality control nowadays is crap, I am going to have to get mine remachined if I ever have a hope of using it.
I have never used a reg, but I can highly recommend any large expansion chamber.
As far as warsensor, etc. compatibility I believe only the barrels and the feed neck are compatible everthing else is Spyder.
About every other person or maybe every one here will disagree with me, but after using the same one for 14 years all I can say is play with the configuration, try different stuff out. I recommend running with remote on a VM simply due to weight issues, but no matter which way you set it up have fun
Old, Heavy and Loud...I am a lot like my VM.
Dum vivimus vivamus! While we live, let us live!