Continue with Windows Phone?

I've been using a Samsung Focus since November 2011.  I bought it used and it was already released for a year.  It was missing a front-facing camera which I didn't think of much use until I wanted to have grandpa see my son using video calling.  I came from a pairing of a Windows Mobile 6 phone plus a 4th generation iPod Touch.  In retrospect, the WM6 device was awful but I hung onto it for almost 4 years due to the initial cost of $400.

So what are the options now:  iPhone 5S, Moto X, Nokia Lumia 1020?   The iPhones prior to iPhone 5 have a screen that is just too small for reading fixed-format PDFs and the like but the iPhone 5 has a decent-sized screen and iOS 7 is intriguing.  Moto X is also interesting and has some subtleties that I probably would like; it's Leo Laporte's current phone of choice.  Lumia 1020 is too camera-centric and too expensive at this time. 

Well, I'm one to watch my budget so I'm considering the almost year-old Nokia Lumia 920.  Yes, possibly another Windows Phone.