Greenbriar has a great commercial plug-in for moving back and forth between Poser and LW. You can easily create morphs for M3 and other characters in LW if you use the plug-in. I did a bunch for the Anime Doll recently and it was quite easy with the plug-in. It's also costs less than buying Z-Brush, and since you have LW, and I'm assuming you're used to the interface, it seems silly to buy Z-Brush. Don't get me wrong - I've heard a lot of good things about Z-Brush, but you might as well spend less money to get the most out of tools you already use. Cheers!