I just received a set of ten 28mm multi-piece Kolonist Rebels from Simon at Pig Iron Miniatures. These guys are great! They have separate hip/leg and torso/arm pieces plus separate heads. This approach offers the modeler a LOT of posing options without ever putting keyhole saw to metal!
The detail on the models is also great - very crisp and clear. One look tells me that these guys will pretty much paint themselves.
If you're a 28mm SF player and you haven't checked out Pig Iron, give them a look here: http://www.pig-iron-productions.com/