I had a E70 with Deep Sea Blue, and I think that was the best blue to date. I don't hate the pythonic blue, but just something about it that doesn't go with x-line. It looks beautiful on mSport, no doubt. It however doesn't have the depth and presence like Deep Sea Blue. I think the current blue tones make X5 look much smaller, and kinda clash with unpainted plastic trim.
On F15 I had Jet Black with Ivory White and it simply looked amazing. I didn't care what outside looked, and I wanted a simple color, and Jet Black turned out to be the perfect black I always saw in other cars but could never figure out why my metallic black cars never looked "black" like that. What was it, when I saw the jet black on the lot, I fell in love.
So Black with White interior makes a very sporty combination, my trim was wood but it didn't make much difference.
On my G05 order I stayed with Jet black, but went with black interior, black headlines, and aluminum dark mesh because I didn't want any wood or brown tones. I wish they had piano black trim, but they don't. Coming from Q7, I loved how uniform Q7's interior looked, things just complimented each other perfectly. BMW always had busier trim design.
I also consider paying more for comfort or convenience than picking shiny colors. I get it some people want their car to stand out or turn heads, nothing wrong with that but I think in the end you go with what's more important to you within your budget. However, I think that current stock 19" wheels are kind of simple, too simple. Going to 20" gives a much better look overall, no matter what color.
Best of luck.