I reckon if making a speck-tackle outta myself was the objective, I'd get one of the BBAMFR .45-70 fiveguns and have it bright polished, hang some fake pearls on it and if you're really an extrovert, you could mount some tactimo-gadget hangers on it too. Bolt on gadfly accessories to your hearts content. You could shoot black powder loads through it for even greater effect. I 'spect 70 grains of FFg from a 10" revolver should generate clouds of smoke that would be visibile via sattelite.
Personally, I find a nickel 4" model 29 to be about all the glitz I can tolerate, while still punching respectable-size holes about where I want them.
But that's just me.