Spot on JeffL ...
Most of my 2009 minis in red and green or still looking rather good. The whites are also fine and will last longest.
I stopped using blue because they look really good only one season, two max.
I still doubt that LED is the future anymore, because I think the future is really RGB LED.
LED may be a necessary interim upgrade because of the time it takes for commerical RGB to become affordable ... it may never become a retail mainstream item ... thus lending standard LED(s) even more longevity.