Here is the scenario - You have enough money for 2 new balls.  They can be from any manufacturer, but have to be readily available (either current or previous years lineup).  You will normally see house conditions ranging from Medium-Heavy to light.  Very rarely will you see heavy oil, and when you do you'll have to get by with surface changes on the balls you have.  It is assumed that you will use a polyester or urethane ball for spares and dry conditions, this ball is not a part of the 2 you need to buy.

Obviously you can't cover every condition with 2 balls, so the ones you choose have to be versatile enough to get by.  Which 2 do you pick, and why?
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-Clint