What features do you want?

iPhone 5 - Best choice imo if you want something that just works out of the box and has good support if there is a hardware issue (being able to just walk into an Apple store and walk out with a new phone is brilliant compared to shipping it off and waiting weeks like other manufacturers)

If you want to hack around, go Android.
Nexus 4 - Pure Googles!
Samsung Note 2 (if you want the biggest screen out there - surprisingly it fits well in the pocket!)
Galaxy S3 imo is 'fragile'

Nokia Lumina 920 if you want to jump to the Win8 stuff

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]