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Ok, will be nice wheels I think. I think all black is a great choice, but that's just an opinion. Pink tape can look spot-on or competely off. There's nothing in between. If I were you, I would make this decision when all parts are installed, will give you a much better image of the complete bike.
On the stem: tidy solution in my opinion. As long as there are no spacers involved and the angle of the stem is in line with the toptube, it looks fine and wider range of ahead possibilties > looks. I'm building up a Master where I'll be using a threadless 1" headset (Tange Seiki) in combination with an ahead adapter. Might be an option for you to, but I presume that you'll need to cut your steerer tube than which would be a no-go.
What wheels will you use for this bike?