I assume when you said Iraqi figure you mean an insurgent as opposed to regular Iraqi Army (Old Regime). As such the main pionts to look for is a figure with loose cothing dark-ish or para military trousers, head dress not realy an issue but some wear Shamagues (not sure about spelling there), red and white being in fashion. Footware should be open sandles or flip flops. Weapons well if you are looking for sniper you could go for a Draganov, failing that an AK or even an M-16/M-4. RPG would be good for an ambush, or even have him about to detonate an IED with command lines.
As for Hummers I think they would be a good subject for a Group Build, I have been over here in Iraq for a few months now and I aint seen two Hummers the same, you name it its hanging off one. I must get some reference photos.