I am looking to have a custom wedding band built - on the outside it will look like any other domed comfort fit 5mm width band - the custom work will be on the iniside of the band - but I am struggling with which metal to use for the base band - under consideration is platinum (90/10 mix alloyed with Iridium), 19Kt White Gold (canadian mix that apparently does not require plating to stay white), and Palladium - the cheapest of the bunch - the price range for the base band is a bit over $1000 from the lowest (Palladium) to the highest (Plat) with the 19Kt WG in the middle - given that the ring has all high polish smooth finish - what would you go with?