> So I will have 2D, right?

Right. Keep in mind that also some 2D effects like transparency are done using the 3D part of the GPU, so on machines with R300 GPU they have to be calculated by the CPU and thus slowly for now.

> Which video cards are R200?

http://en.wikipedia.org/wiki/Radeon_R200#Implementations
http://en.wikipedia.org/wiki/Comparison_of_ATI_Graphics_Processing_Units#Radeon_R200_.288xxx.2C_9xxx.29_series