opinions needed regarding available EFI for a small block

Hey fellas, I have been beating my brains and chasing demons trying to find a way to inject my 360. I was leaning towards factory Magnum beer barrel efi, sure seems like the hard way. However when it breaks it can be repaired with parts from any auto store. Recently I have been more and more intrigued by the aftermarket and the various all in one throttle bodies...ie MSD, Fast, Holley etc. I really want to just be able to turn the key and have it light up with in a half revolution, and compensate for altitude etc. I just want the modern driving experience fairy tale in my 71 Duster. Anybody have experience ether way with any of these set ups and advise? Thanks, Dan