Color? Actually it doesn't matter a whole lot if you buy quality paint from a real paintstore like Sherwin-Williams or Benjamin Moore. More importantly, you must do proper prep on your house's exterior to get a long-lasting paint job. Pressure washing off mildew, dirt, grease, and grime is a start. Scraping and sanding loose paint areas is imperative. Apply a quality primer to bare spots and topcoat with a 100% acrylic latex paint like SW's SuperPaint and you will get 5-8 years of service before the next repaint.
Darker colors do tend to fade more than lighter colors.
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