jake, just let it sit in the primary. don't worry about a secondary fermenter in this situation unless you have a specific reason to do so (dry hops, adding fruit, etc). there's no reason why the yeast couldn't have dropped it to the final gravity this quick, but don't be fooled into thinking that fermentation is "over", after the sugar is eaten and alcohol is produced, the yeast will continue to work and clean up by products and flocculate out. you will get a cleaner, brighter beer if you allow it to sit in the primary for another week or so. i normally do 10-14 days, sometimes more in the primary and then go right to keg or bottle.