[mcb3k]

The Droid Razr M is about the same size, at 4.82 x 2.40 x .33 inches[1]. It's only .09 inches wider, and .03 inches deeper than The 5s, and it is actually .05 inches shorter[2]. I'm not sure if you'd still find that too big though.

1: http://www.gsmarena.com/motorola_droid_razr_m-4973.php 2: https://www.apple.com/iphone-5s/specs/