New 4-Stroke or Old 2-Stroke?

I need an outboard. I'm debating on a new Tohatsu 40hp 4-Stroke or an old 2-Stroke Evinrude or Mariner. The old 2-strokes are 160lbs vs 210lbs for the 4-Stroke. The 2-Strokes are also only $2k vs $10k for a new 4-Stroke. I can afford the 4-Stroke I just don't know how to justify it. Its going on a good condition 2003 Starcraft SC160. Which one would you guys buy?