Use this app to get a better idea of what you need for a tractor...
http://productselector.deere.com/CustomerTool/NACutsHomeServlet?targetMarket=AG
Answering these basic questions will help narrow your search
* How will you be using your tractor?
* How much property do you have?
* How many acres will you be using your tractor on?
* Do you expect the land size to remain the same or expand?
* Do you plan on doing any custom work for friends or customers?
* Who will be the primary operator of your tractor?
* How much experience does the operator have with tractors?