The Nexus 5 is the best value for money you have there good choice, but if you want something special later on, try the HTC One (or the all new One which is coming out the 25/03) you'll be blown by how the device feels and how it delivers in terms of multimedia (screen/sound/cameras ect ect)
I have my eye on "All New HTC One" too, but it all depends on price. If price is set too high, I might just get the One (2013) instead. I hope they decide to give us back an sdcard slot