6200 is just the entry level card and has good price/performance ratio , 5200 is a very bad choice even for rs 2k to 2.5k
6200 is a good card and costs around 3.5k and its waaaaaayyy better than a 5200 . has support to sm3 . I was very impressed when is saw the various benchmark scores of this card .
*www.tcmagazine.info/images/reviews/BF2-GPU/bf2-8x6-low.jpg
more details here
*www.nvidia.com/object/geforce6_techspecs.html