What are some good vocaloid songs?

I like vocaloid and I want to get some new songs, what are some good songs? Not really popular songs please, I'll probably already have them on my computer. Also I don't like Meiko so much. I really like Gumi, Rin and Len, Miku, and Piko. Actually there aren't many that I don't like...and some Miku Append songs would be good...