The black and orange really make the watch pop!
I would personally wear it with a black leather strap with matching orange coloured stitching, that would really complement the watch. But each to their own.
20mm strap will fit anything that hasn't got those bracelet end lugs attached to the watch. A bracelet from the SMP 300 should fit provided the lugs measure the same.
There's a chance it won't though, your best bet is to go to an Omega AD or Boutique and consult with a competent representative; perhaps even try one of their bracelets on and see how things fit together.
Once again, stunning watch!
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