Personally, I would go with your second option, using Xereus or Druchii Violet and the Genestealer highlight, works well for DE. You could also try Reaper's Royal Purple for highlighting, or perhaps Vallejo's Sunset Red?
I usually use Reaper's Sparkling Amehyst, Regal Purple and Royal Purple, with a bit of Vallejo's flourescent Magenta mixed in for highlighting.
Cheers.