At this point, I would recommend just getting Blazblue: Continuum Shift Extend. It has an abbreviated version of the first game's story, all the stories from Continuum Shift 1/2, and new stories for Makoto, Valkenhayn, Platinum, and Relius. There are seven more characters in Extend, three new modes as opposed to to Calamity Trigger, and improved balancing. You can get the PS3 PAL version for ~$20 from Zavvi right now if you pair it with another game. It's a very good deal for probably the most underrated fighter of this gen. No bullshit X-Factor, Pandora Mode, bug fixes or gem crap in this game.
Still, if you REALLY want to save the $10 or can't find another game to pair Extend with, $10 for CT isn't bad. Thanks for posting OP.