That's actually a lot of progress. There are a crap load of SCE and DS9 novels. (And Vanguard is totally awesome.)
Regarding Voyager, if you're going to read the first four, by Golden, you probably want to do that before you read A Time To...; it just makes a couple little details flow better. Plus they're really tiny tiny books and it won't be too difficult.
Definitely read Titan as it branches off. It's really good, until Typhon Pact.