I love World Creator, especially the vegetation distribution pipeline. You can create some very realistic fields with it. Im going to check out impostors too - ive seen it a few times and wondered what it's about.
Stupid Rental. My Zbrush that I haven't paid for an update in years and is perpetual Trumps that on all counts.
How To Unwrap ZBrush models in 3DsMax
Learn how to UV unwrap high polygonal ZBrush models in 3DS Max without loosing details.