I'm learning towards the black on black after having only seen Seiran Blue in person. I'm interested to see what Gun Metallic (maybe recreate a little 40th anniv magic) and White both look like with red interior, though. Boulder Gray could be cool too because of how the color will probably look different in different light. My wife's XC40 is Thunder Grey Metallic with black roof and sometimes it looks way more blue than grey, other times it looks like light grey, and sometimes darker grey--which is kind of fun if you get bored with your car always looking the same in all types of ambient light.