Just a month ago, I purchased my first (ever) smartphone, an LG G3. At first, it was quite big (5.5 inch screen), but I've got used to it and appreciate the large screen (you can practically watch movies on this....especially with the True HD 1440 x 2560 pixels). It also came with 32 GB and 3 GB of RAM. The battery is removable and can even use a larger battery (if needed). I picked this phone after looking at all the others (Moto G & X, HTC One, Samsung S5 etc...), but I simply wanted a phone with excellent hardware specs. The LG G3 had the best specs to offer and users seemed very happy with it......I certainly am.
In that midrange budget, the Moto G is a big winner in most reviews......the G3 is slightly above that price range though.
Here's a good discussion on all kinds of mobile devices:
http://forums.anandtech.com/forumdisplay.php?f=37