I have both the K4 NT and the Touch and I must say I prefer my Touch right now, eventhough I rarely if ever use TTS. It's just way easier to navigate with the touch screen, collections are easier to make without having to scroll through the entire keyboard to select a letter etc. I bought the NT first because I was afraid I would miss the page turn buttons..well surprise I don't..the Touch is so easy that I have room on almost the entire screen to just tap to turn my page. Left side tap is to turn a page back, top page tap is to open the search bar with menu button..and the rest of the screen is for tapping to turn page forward. Awesome. My K4 NT is now used as my back-up device as right now I only use my Touch to read.
But that said, I love the K4 NT too, it's a great step in device for people who never had a kindle before and a great follow up on the K3.
I'm sure you're going to enjoy yours.