I've always had an iOS device, but no room in my life for two of them:

2007-2008: iPhone 1st gen --> 2008-2010: iPhone 3G + Nexus One --> 2010: Nexus One + iPod touch (sold iPhone 3G) --> Late 2010 - May 2011: Nexus S + iPod touch (upgraded to Nexus S) --> May 2011 - present: Nexus S + iPad (sold iPod touch)