I am mostly a DC comics guys but a lot of those titles you mentioned kinda started fresh last year, like for example thor #120 or something reverted back to #1 so thats probably a good place to start. The only one of those titles that I read is spiderman. With that I would start at amazing spiderman 698-700 and then start superior spiderman 1.

also check out this forum if you want to just download these comics for free, its saved me thousands of bucks.

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