with my machines, rig 1 is silver with beige drives/etc and rig 2 is black with 1 black drive. i think the all black approach looks nicer but to each his/her own.
here's a pic of my 2 rigs from a little while ago (while i was building #2)...as you can see rig 2 doesn't yet have the PX716a (w/black faceplate)...but it looks virtually the same even w/the drive installed.
HTH. oh yeah, and you can always buy custom colored faceplates for virtually any/all opti drives.