I wanted to compare somewhat similar games which is how I settled on Warmachine, WWX, and Malifaux. All three are using plastic or plastic and resin figures currently. Malifaux is aiming to replace thier metal line with plastic so I thought that was a good comparison. Beyond that, all three have what I would consider "reasonable" starters which should be able to get you to a playable level of force with only the starter box. They are also all within the Skirmish to Squad based game size, which I believe makes them comparable.
Having my choices limited down and the approach I wanted to use for comparison in mind I set out to gather some information and compare away.