Think seriously about dipping into DC's fabulous back catalogue instead of (or as well as) reading current series.
There's some tremendous value in back issues, and some wonderful old series available in trade. For example, last time I checked Mike Grell run on Green Arrow was available at a snip for back issues. And James Robinson run on Starman is available in various formats.
Put it this way. You're pretty knowledge-able on Marvel… you know that plenty of old Marvel stuff published in last 20/30 years is every bit as good as todays output. DC's no different.