If you don't want the Wolf standard oven, I agree that Miele is a good one to look at for both. Or Gaggenau. Or Thermador/Bosch. They don't need to match the rangetop, and there are no issues if they match each other.

That said, I think you could also put the Wolf CSO (as long as it doesn't have colored knobs) with a Miele or Thermador oven without it looking weird. The trick is to put several inches between them, so it looks like they're supposed to be a little difference. Use the space for an accessories drawer or a pull out pot landing shelf or whatever. The styling on these ovens isn't so different it would make them clash.