imjouster - Don't worry too much about having all pearl balls, especially since you're (according to your profile) a high-rev player. You can always use pin placement/layout and core shape to help a ball deal with carrydown. (simply put, a ball that flares more will deal with carry down better than a ball that doesn't flare much). That EGO with a pin 3-4 inches from the PAP will deal with carrydown just fine. Alternately, you can sand down the surface of any pearl to get it to move sooner if you need to.
You also need to ask yourself what spectrum of different lane conditions you expect to compete on. If you don't bowl in more than 5/6 different houses a year, what you're proposing will cover just about everything you'd need.
The only problem I can see with the arsenal - where are you going to get a 5-ball bag?
Don't worry about posting arsenal questions - I don't think people get sick of them, just sick of silly/inane arsenal questions.
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Kill the back row