lg g3 or htc one m8
one of these
The LG G3 has a really high definition display, which is nice, plus quite the good camera. Glass has this phone, and he's shown some pictures, it's pretty nice.
The HTC One M8 has a worse camera, lower resolution display, but an awesome build quality.
Both phones are going to run quite fast, however the LG G3 has 1 more gig of RAM.
I personally wouldn't go with the S5, simply because I hate the look of Touchwiz and I think Samsung phones are ugly in general.