Of these, I would say the Santal Impérial is the finest, but it doesn't have a great longevity. Citrus Bigarrade does have good lasting power, but it is very citrusy. If you like that, it's a very good choice. Bois de Cédrat is quite elegant, but also tends to fade quickly and stay close to the skin. I don't know Orange Spice well enough to comment on it. My personal choice would be the Royal Scottish Lavender. It's quite an old scent in the line; of the ones you mention, only Santal Impérial is older. The Lavender is a real classic, a green lavender sweetened with a little orange blossom and the usual beautiful sandalwood and ambergris base. You could do a lot worse (unless, of course, you really like big citrus scents)!