Hi Liquidd,
I heard about RetroMags from an article on either Kotaku or RockPaperShotgun, and love the work they've done and the organizing behind it.
You mention being an artist and looking for old PSMs. It just so happens, that was the only mag I ever subscribed to. I recall for a while there they were hiring artists to do their (the artists') own version of game characters and so on for the covers, rather than the somewhat more standard use of official art. I bring it up because I'm curious if that was something that was important to you given your art inclination?
Also, great question, hope plenty of others reply as well.