Snow Crash and The Diamond Age are good books, especially for just starting to read again. Ubik is my favorite PKD book followed closely by Electric Sheep. The His Dark Materials isn't really sci-fi so much as fantasy but it is quite a good read (though if you didn't have a kindle it might be embarrassing buying them from the young adult section, they are quite adult though). I think a huge thing missing from your list is the Foundation series from Asimov (I recommend going in order of publishing, start with Foundation move onto Foundation and Empire then Second Foundation and more if you are into it). My 2 cents.
Also recommended in this reply