Nvidia has a numbering system where the first number denotes the current line (7 being the newest) and the second number generally indicates the ranking within that line.
6200 is fairly low in the 6 line, whereas a 6800 is near the top.
In addition there are suffix labels, such as LE, GT, Ultra etc. that further indicate the ranking of the card within a certain model. Unfortunately there is also some overlap, so (just an example) a 6600 Ultra is better than a 6800LE.
I have a 6800 Ultra, which makes it the top of the 6 line. Now a 7200, just because the numbers are higher and it's newer, is nowhere near as good as my graphics card.
The ATI system is similar, but they are now up to their tenth X(10) series, as they generally follow suit with direct x versions. To confuse things further they sometimes have the same acronyms at the end of a card, but thay mean different things, so what is high end for nvidia may be low end for ATI.
I hope this helps some people choose a graphics card, but the best thing I suggest you do is do some research.
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