Granted, there's not too many good ones of these out there for this one to be graded against, but Farming Simulator 2011 is a pretty solid entry. No bugs to be seen, and an entire valley to roam and work in, makes this a very viable alternative to good ol'SimFarm. There are piles of different vehicles to use, and you can hop out of one and into another nice and quick. There's enough here to let you correctly plant and harvest several types of crop, and see it all the way through to market.
The game runs fairly well, but is pretty demanding, so those of you barely meeting the minimum requirements would be best to crank the settings down first and work your way up from there. The game looks great maxed out due to that, and seeing the changing times of day while you're working is pretty awesome. The workers you can hire sometimes come with extremely low IQ, though, which can be a bit of a pain - small sections of a field are sometimes missed repeatedly, causing you to have to backtrack and finish the work.
It has a few quirks, but if you're looking for a cheaper game that comes standard with the bigger fields the 2013 version was missing until the dlc release, it's hard to go wrong with FS 2011.