Haven't really been a big fan of the Titan Releases over the past decade or so, having been a reader since the Dark Horse days...
That said, I recently picked up a copy of Alien : Into Charydbis.
Felt like a slow burn at first, yet I'm 170 pages in so far and absolutely f**king hooked! I sure hope the book holds up this level of quality throughout (or indeed succeeds it).
Overall, it's easy to get into and follow without any prior knowledge of the authors previous endeavour The Cold Forge.
Although I understand that both TCF and Alien: Phalanx are also highly regarded, so perhaps next then.
The last Alien story I enjoyed this much was Stephanie Perry's 'criminal enterprise'.