I second the suggestion of
Hitomi Yaida's "CHAIN".
"ANDANTE" is also alot of fun and funkiness mixed with some pop art influences.
CHAIN

Hard to capture the essense of this one with just one screencap.
ANDANTE
I want to see Kodoku na Cowboy, I think that's the only YAIKO PV I haven't seen. It looked excellent from what I saw on the YAIKO's selection DVD.
Shiina Ringo's "Mayonaka wa junketsu" is one not to be missed too, that's if you haven't already seen it. Fully animated since she was pregnant at the time, with quite a unique style of drawing about a story of a female espionage with her cat fighting an evil organisation.