What a coincidence! I'm currently reading Death Masks
(Dresden Files bk 5). Since it follows up in large part on the events of the previous book (with new mayhem thrown in), I'd recommend it. I'm only a few chapters in, but I'm enjoying it.
A Clash of Kings
is waiting in my to-be-read pile.
I haven't read Cast No Shadow
yet, so I can't comment on it.
I really liked Children of the Storm
, and recommend that be your Star Trek
purchase. It's a terrific story, with some nice character exploration of both screen characters and new literature characters.