Re: Confusion about 6200 and ogl2...
Stick with NVidia. ATI have crappy OGL driver. Even more SM3.0 features from OGL are not yet supported in latest ATI drivers.
NVidia have more mature drivers with very good GLSL support.
All NV4x & G7x chips have support for OGL2. Note that only 6200 don't have full support for FP textures, but all other features are supported.