I just preordered Jagged Alliance: Crossfire, which releases here on Friday. I saved 33% by doing so, so...
It may end up being more frustrating than Back in Action, though. I've talked about what makes Back in Action good and what makes it bad here already, so I won't go into details. Simply put, though, it's a game that punishes the tiniest mistake severely. The AI also has an unreasonable advantage, making shots that a mere human couldn't possibly manage because they require such precise positioning of your soldiers. Other technical issues also compound this problem.
Crossfire has a chance to change this, but ... going by the description, which states that supplies are scarce and you'll have to make good use of what little there is, I'm worried that finding armor ( which deteriorates incredibly fast, is expensive and can't be repaired in BiA ) will be even more difficult, and there will be even fewer kits for repairing weapons.
Anyway, none of my complaints about BiA negate the fact I've played the game for far longer than most games in my Steam library, frustration or no, and I would've gotten Crossfire regardless.
Edit: I should mention this, because I find it funny.
The mentioned thing about body armor not being repairable by your mercenaries bothers quite a few players. I find it .. realistic? I mean, using oil and other tools for fixing up weapons I can understand, but repairing a kevlar vest in the field? That seems ... I mean, don't get me wrong, I'm no experts on ballistic vests, but ... it's riddled with bullets! How are you going to fix that!? ( Nevermind that you'd probably be dead long before )