Is that one with the women the thing with the human one sleeping with the Klingon who's holding them prisoner and there's pon farr nonsense and...

No, that's Dwellers in the Crucible! which is also awesome. ^^

Price of the Phoenix is one of the older Star Trek novels, before they were numbered - it's got Kirk dying (or was it Spock? no, I think it's Kirk...) and there were...clones? something? There's a renegade scientist named Omni who's playing mind-games with them. Totally ridiculous OTT stuff. I loved it!