Just don't get to excited about DarkPhysics. It's ok, but it's not the best. There are features available through PhysX that haven't been implemented in DarkPhysics, and from the sound of it they wont be, and if you aren't careful in how you use it the framerate can drop significantly, and there are frankly better Physics DLLs for DBPro available.
XenoPhysics - Isn't done yet, but shows great promise. It's based on the Havoc Physics engine, which is what most modern videogames use these days.
http://forum.thegamecreators.com/?m=forum_view&t=162138&b=8
Newton Game Dynamics Wrapper - Haven't tried it myself, but it looks good.
http://forum.thegamecreators.com/?m=forum_view&t=154086&b=5
But also, don't let me discourage you. The DarkStudio Bonanza Pack is a great deal, and I would highly recommend it to anyone wanting to get started in game programming. DarkPhysics is good for getting your feet wet in that area of game making. When you're ready to move beyond it's capabilities, the others I mentioned will be there.