FOUR STROKE
At this point in time I would suggest purchasing a Four Stroke engine.
The price difference between 4 stroke and 2 stroke engines is about 20% if you shop around.
You will quickly make up this difference in gas and oil savings, especially with a larger engine like a 200 hp.
When it comes for you to repower in the future, your 4 stroke will hold its value much better than a 2 stroke.
Plus you also get the benefit of increased range for your boat,less noise and you will be helping to limit the amount of pollution you contribute to the enviornment you enjoy.
As for manufacturer, that is a loaded question and I am sure you will receive many responses.
Personally I would suggest Yamaha or Honda, as they have a very good track record with outboards and 4 stroke.
I own a Yamaha 4 stroke, VERY pleased with its performance and fuel economy.
While shopping for the motor, I heard this quote from several dealers:
"I hate these 4 strokes, we make no money on service, nothing goes wrong with them"
Now ofcourse they were joking, but there is truth in their statement.