That's a bit harsh! I don't mind my standard dash.Imho, I probably wouldn't bother with the Discover sat nav. It isn't a patch on a decent Tom-Tom or Garmin (again in my opinion). I would add the comfort dash in place of the Discover unit as standard dash is a bit plastic-fantastic (assuming that option is still available).
Anyway welcome @Smarty ! It's all personal choice and budget at the end of the day. You go with what you feel you like it all soon mounts up in cost.