nexus 5 is just under 5" specs and dimensions of it were released early this morning.
like I said earlier, the HTC One is only 4.7" has a sleek design. Camera is not as good as the iPhone 5, but it's better than the moto x. Especially in lowlight situations.
I would get the google play edition over the bloated carrier versions.
Also, nexus 4 does NOT have LTE.
The Nexus 4 does have HSPA+ which is essentially entry level 4g. While it may not offer the full 72Mbs it does offer 42 for carriers like AT&T and T-Mobile (Pending market) In real world it is more than ample for most nerds...
That being said I would buy the Nexus 5. The best thing about the Nexus line is you get the updates first run. (If that matters to you) I personally love the purely vanilla experienced on a Nexus or Google Play Edition running stock Android.