NEX-6: Need external flash suggestions

I can't believe some of you guys suggesting manual flash when OP has not had any experience with external flash before and is asking for a easy to use and easy to set up one.

Forget about the suggestions of using manual flash.  There is a learning curve, and it is definitely not easy to set up as compared with TTL flash.

I would stick with TTL flash.   Any of the Sony flash (except those designed for NEX-5 accessory port) would work.   Some may require the use of a $25 adapter.  There are also many 3rd party ones available, just look for TTL compatibility (preferably wireless flash compatibility too in case you want to explore wireless flash in the future).