The problem with "lite" versions of software is that they always seem to leave out one core feature. So you'd get Poser 8 Lite, with no hair, dynamic cloth, or setup room, but also no IDL, for example.
Of course, one person's core feature is another's bloat. Someone else might like that set of features. A very basic and functional core, with lots of available additional modules would be nicer so you can pick and choose what you need.

I realize that this is exactly what Daz Studio offers. But for some reason, I could never get the hang of posing in it. So I chose to go with Poser 8, rather than Studio plus a bunch of modules. But the basic idea is a sound one, I think.