Well, I am using a mix of this terrain and and Sn00pys C3C terrain and some others. Sn00pys mountains with Womocks mountains as LM, Womocks Ice-capped mountains, and original volcanoes (athough I did replace forested volcanoes with Sn00pys, to mimic those volcanoes that look dormant, but aren't).
I have a mix of the original files you can get from my sig. I especially like what I did with the irrigation, although I have a much bigger variety now.
I would love to see redone volcanoes ala Womocks, but until they are here I would suggest using either the terrain above or:
Mountains, Ice Mountains - Womocks
LM Mountains, Forest/Jungle Mountains, Forest Volcanoes, Forest, Jungle, LM ForestCoast, Ocean, Sea, Marshes - Snoopy
Volcanoes - C3C (I like the charred tops, and the reddish base works for the volcanoes since that is lava rock.
Irrigation - Combine Womocks (grasslands), Sn00pys (plains), and original (Desert and Tundra). This combo really shows just how irrigable and lush each terrain is.