I live on 5 acres with a lot of trees and some brush. My trimmer just died on me, and I am needing a reliable new trimmer for my property. I am wanting to spend around $200 - $250. What would be the best / most reliable one in that price range? Also, what are the advantages of the straight shaft versus the curved shaft. Also, I would like to be able to add attachments if that is possible in this price range. Thanks for all suggestions.