We just so happen to have a new failed dollar cycle. This means we should expect the dollar to trade lower into its next expected cycle bottom, which regularly happens in 18 to 28 day intervals.
There are daily cycles (short term), intermediate cycles, yearly cycles, and the three year cycle. Once a daily cycle fails, this signals an intermediate cycle decline. I happen to believe this drop will magnify, taking out the previous intermediate bottom and possibly even the yearly cycle bottom. Bernanke has the printing presses going at full steam, which should result in a waterfall decline into the dollars yearly cycle low. Once that bottom is reached, you should be ready to make some advanced grain sales.
How high corn can go is really not answerable. At the very least, $6.60. The real question is when. A rally of corn into late February (which corresponds with a waterfall decline in the dollar) will likely carry corn higher than that.