That rig is really, really imbalanced. If you just use Zbrush, Photoshop and Xnormal you should be fine, but for anything that uses a GPU you should have at least a GTX 750 Ti or a GTX 950.
reno 911, rent Dune or buy it. LOTR series. sci-fi audibooks 2 to 3 hrs a day. Join dozens of forums post something about $ex thentry respond to each comment.
It's nice, better than any Kirby IMO, but it's not alt-tab friendly. I get treated to a black screen (no input either) when I switch back Athlon 950, Geforce2gts 64mb, DX9c, and WinME.
btw, just saw another cool forest enviro which can give u some suggestion on how to lift your terrain and other arrangements: http://www.polycount.com/forum/showpost.php?p=1278675&postcount=981