merc 9.9 options to go with

Recently my Evinrude 8hp 1997 conked out on me and I spent about $550 in water pump, carb job and temp sensor. Still won't run longer than 20 seconds before it overheats and shuts down. So instead of pouring more $ into this, I was checking out Merc's 9.9 line. At first, was thinking about...