Request for experience: when has having only 16GB on your iPhone inconvenienced you?
Video Capture, more photos, larger image sensor and better camera on the iPhone 4S means I'll spring for 32. Even with iCloud and all the music streaming options, I find I always want 4 GB of core music (and another 2.5 of podcasts) with me. Having room for more serious app and book (PDF) storage will be very nice.

The 14 GB iPhone 4 I've used since it launched was sufficient except for maybe a handful of times where I wanted more space. Especially when using iMovie to assemble slide shows and short video updates on a longer trip. Also, if an apple keynote or other hour long video comes out, I don't have the space to accommodate such videos. 



Those are the few times when "the 16" wasn't enough for me. I now don't take several databases with me using bento and filemaker pro since I want more space for songs and camera footage.



I initially thought of a white 32 iPod Touch and the smallest black 4S - but having all the space and speed in one package makes it more of a computer to me. I can grab a bluetooth keyboard and get short work done if needed. I'm also quite eager for AirPlay and a 4S.