It's good to see so many other Reznor fans are out there!
Sadly, Houston will not see any NIN this year. :\
Picking a favorite song or album is an impossible task for any fan. I do remember the songs that pushed me heavily into NIN where when Wish came out on MTV back in 92. That really pushed me into discovering their music and soon after I ran across the video for Eraser - Live as one of the posters said and then ran into bootleg albums like Rusty Nails which introduced me to "Live in me - Old Unreleased". That was it. I was sold ever since.
Then again, my spotify playlists lists my favorite albums (based on the number of songs) as TDS, Fragile, With Teeth, TGWTDT, and PHM.