In regards to the DS9, did you read them all or stop at Warpath? The last two, Fearful Symmetry and The Soul Key, sound like they take place in the mirror universe and I'd probably prefer to skip those if thats the case.
that was actually my plan just as yours seems to be, because I didn't have any interest in reading just mirror universe books. But as previously stated, mirror universe is just part of the plot, and it actually continues the story from Warpath, so its something you'll want to read and worthwhile reading.
I've read two Titan's book, and Chris' Orion's Hounds is next up on my list. I'm enjoying it so far.