How integrated into iOS are you? Do all your calendars and email sync from iCloud? Do you run a Mac or PC?
Are you happy with iOS? I was looking at moving from iOS to Android, and the Nexus is mighty tempting, however I use a Mac and all my work stuff is Mac, so an iPhone made sense. I'm sure however there are many who use Macs and Android. If you can hang out till Sept/Oct could very well be worth your while.
IMHO The Nexus is the better piece of hardware by far, it just depends what operating system you are comfortable with.