Quote: "What is the best free 3D modeller? "
Ouch, just hope RPGamer doesn't see that bit, as he put all that effort into the sticky title 'please don't ask whats the best 3D modeller' and tries to make it as eye catching as possible.
The question you are asking is down to opinion, its like whats the best Chinese resturant in cambridge, we all have our opinions, some will prefer others, yet there will be those more popular.
Quote: "Oh, and please nothing that will screw up my computer "
None should screw up your PC, however you should always make sure you're PC is compatible with minimal requirements, as with any game or program, check the processor/cpu, graphics card/VRAM, ram and OS, if you fall below one of them it may cause you problems, like when I bought GTA 3 for my old PC, didn't work because it needed at least 16mb Gfx.
Finally, free apps I recommend are
Animator - good modeller, good for animating to .avi, but you cannot export the model as an animation for use in DBP/DBC
Blender - Hard to get your head around, but its probaly the most powerful free app, but is a beast to learn
Wings3D- Great for modelling
TrueSpace 3.2 - Its a lot like the newer trueSpaces (not like 7 though) it has some nifty features, lacks bone animation, good physics, I found it felt a little old skool, but its a cool package, and for free its quite nice once you work it out
PiXel Vision- I'm just kidding,