Need a mobile with gorilla glass, nice camera(primary and secondary(2MP at least)), nice battery ( >2300mAh), expandable memory, good loudspeaker.
I also wanted to give the moto x a thumbs up but he said that he needed expandable memory.........
I completely agree with but I was just suggesting on the conditions of the OP. For me the S4 just plain old SUCKS, it won't get more than one major update and touchwiz is one of the if not the crappiest and resource heavy skins out there. I also think that OTG is way better for viewing a media collection. I have my media collection on a 1TB hard drive and can watch it anytime with my Nexus 7 courtesy of USB OTG. I mean what is the maximum storage one can get from an external micro sd card, 64 gigs on a S4 and 128 gigs on the HTC One M8 while with USB OTG you can get up to 1 TB of storage without external power.