Ooh Tough question! So many pretty shades. I guess I would try the super shock shadows first since that its the first thing I tried from the line and they are somewhat unique. Get some permanent items and maybe a few from these collections that have been coming out every week.
Super Shock colors I believe are all available and permanent - Nillionaire, Flower Shop, Prickly Pear, So Quiche
Tops from the limited collection - $aucey eyeshadow palette from the Iluvsarahi collection- not super shock but a regular powder eyeshadow. I just love the combo of duo chrome peach with purples. So pretty. Wore it twice this week and had to stop myself from wearing it today. I have other pressed powder shadows but I haven't played with them long enough to have faves yet except for Pinky Promise.