Need a little help

So instead of writing a 20 page essay for an intro to aeronautics class I am taking this semester I can choose to make a model plane. Anyone have suggestions of what to get? The only criteria is that it must be a real aircraft and larger than 20" and cost less than $150 USD. I was hoping to do an RC model, but finding a ARF with a controller/receiver for that price is nearly impossible. 
