I use a black SGP Linear (crystal series) on my white phone with my SGP Glas.t. Looks awesome and feels amazing in the hand. I also keep them with the holster from my Seidio surface holster/case combo and that works really well too.
Tried the white/gery bumper but the white rubber part gets dirty to quick, black bumper looks good on it, right now I'm using a black/white bumper and it looks pretty good, the bumper is all white except the rubber trim part is black.