If I had the funds to get a brand spanking new phone I would probably get the Note 2 or Galaxy S3 but when it comes to a second hand phone I would go for the Iphone because finding a second hand Iphone is easier than finding a second hand Samsung phone that's reasonably priced and unlocked.
I was really careful messaging people because in my mind they're all scammers lol, I read this one post where this guy bought a second hand Iphone 4 but it would only show the apple logo and then turn off LOL and he was selling it for $180... I was lucky I stayed up really late and found this one posting on craigslist which turned out to be a really nice girl. I bought the phone off her for $200 it was a black 16gb Iphone 4 :D
No dents or scratches, just finger prints.
Came with everything in the box :D