I voted for Santorini because I like individual blues. If you are set on your choices, that would be mine.
If it were me and I was set on blue, I'd seriously consider (glossy, not frozen) Monte Carlo Blue and perhaps Laguna Seca Blue. Actually, MCB would probably be my choice.
If you are going the red route, I would much rather have Imola Red (best BMW red ever!) than Hellrot.
As for the wheels, rather than painting them black, why not have the GTS wheels installed at the port? Maybe you want gloss black rather than matte...??
2014 550i M Sport | Glacier Silver/Black/Anthracite | Executive | Lighting | Luxury Seating | Black Grilles | 20" OEM Style 303 w/Bridgestone S-04
Past BMWs: 2013 E92 M3, 2012 F10 535i, 2011 E90 335i, 2009 E90 M3, 2008 E70 X5, 2006 E90 330i, 2004 E46 330i