We have an E90 335i in SG and while I think the colour was nifty three or four years ago, I don't think it's as appealing anymore (just my own personal opinion thats all).
That said, I'm not sure about the viability of a frozen type finish in my climate. My vote is for a SG paint finish with a vinyl wrap on top. The wrap can easily be removed later, and will protect the OEM paint colour underneath-best of both worlds.
2011 E90 M3 Alpine White on Fox Red
2007 E90 335I Graphite on Terra
2005 E83 3.0I Mocha on Black (Gone and forgotten)