LightWave is your entry point into a whole new world. You get a ton of cool and useful features right out of the box that puts the competition to shame. No "unlimited" this or "advanced" that, no up sell and no extras. Everything you need is in the box when you buy. Of course, there are many cool third-party add-on products available, some freebies, and some not, but the point is, you can get a long way before you may need any. And, with free render nodes, LightWave grows with your business, and you.
Current Version: www.newtek.com/lightwave/lwtrial/
Unity Documentation: http://unity3d.com/Documentation/Manual/HOWTO-importObjectLightwave.html
Unity Scale Calibration
Exporting to Unity