You should be able to put PC3200 ram in the board. However, since this board does not have the 5th divider, I doubt you'd actually utilize it. Putting PC3200 in the board while running the fsb at 133 would make the ram recognized as PC2100, and it will perform like one.
Depending on how you will overclock, the ram choices would be like this:
You should probably get the choice near or above the fsb you plan to run your computer at, that way you can still have your ram set to the best timings without causing any problems for your OC
Now, it all depends on your plans for your OC and your future computer. If you plan to use the KG7 for a while, maybe PC2700 or PC2400 might be a more realistic choice. This is so you can actually utilize what you are paying for. Of course, the price of PC2700 isn't that much less than PC3200, so getting the 3200 might be an option, though you might never use it to it's full capabilities. But if you want to get a new mobo in the future, you can just get PC3200 and use that in the KG7 till you get a new mobo. Either way, there should be no incompatability problems with ram rated higher than PC2100