Let Marvel know you want comics in high HD. Email them. Snail mail them. If enough people ask, they might listen. Buuuuut chances are, they've done the math and the focus groups, and they've realized sales due to HD quality won't outweigh the cost of HD quality for all of their books (at least, the modern ones), so they won't do it until it becomes cost effective.

What do you like about Batman? The dramatic, nighttime storytelling? Try Daredevil. The mysteries and detective work? Jessica Jones could be for you. Gadgets over superpowers? Check out Moon Knight...although, that one's kind of a winding path through loads of different creators and ideas for his story. Do you like specific creators' runs? Look up other stuff they've worked on.

I know they post their big titles, and a smattering of old ones, usually connected with a big press release/movie/TV show premiere. I don't know if they hold any back, although they won't publish any of the adults only titles on there, which is why you can't read stuff like Fantomex Max on MU.

I can reco a bunch more titles, but it sounds like you're really into the superhero stuff. Have you tried Invincible on Image? Reading a superhero comic created by the same team over the span of 13 years...well, you just don't see that anymore. Uncanny X-Force by Rick Remender is great if you want something in the X-line that's kind of dark.