Great write up.
I found I have all the purples in every normal sized army I make, so I found truth in it.
I like some of the yellows, but I really know they're not amazing. However, the synergy of a flyer, fast cav, and scouts, all in the same army going for the same goals really works well. It's 300 points of mischief and mayhem. I don't leave home without them, even at 500 points.