I am a uber-Trekkie so I buy all of the IDW Star Trek books. The Countdown series is kinda hard to recommend to people because it is written well and the art is amazing, but I think it gives away a lot of the movie's plot. Honestly, I wish I had waited until after the movie to read it because I feel that enough stuff was spoiled that I can guess what the plot will be. The bottom line is read it at your own risk.
If you don't want the movie spoiled at all but still need some Trek, I would highly recommend the Alien Spotlight trade paperback
(the Borg issue is one of my favorite single issues of all time) or the Alien Spotlight: Tribbles
that came out 2 or 3 weeks ago which was surprisingly great.
As for the movie, it comes out May 8th.
Thanks man i may wait till after, might try the tribbles issue though i love the DS9 episode with them