Why is HTC and Samsung your only options? The Sony Xperia is a good phone too, in fact the current Xperias are all waterproof etc.
Anyhow, i have this one (Xperia Z1 Compact):
http://www.sonymobile.com/global-en/...ia-z1-compact/
Loving it, it's same size as the iPhone, but got all the power that you get in the S5/HTC . That is of course if you want something smaller, if you want big, then there is still the Z1 and Z2 Xperias.