For Me It's Gonna Be...
the 3G unit with 32GB.
I don't have an iPhone. We just recently switched to Verizon from ATT, so no iPhone on the near (2 year) horizon.
I don't have ready access to WiFi hotspots, nor do I want to have to search for them on the fly, particularly in a strange city.
Though I don't travel that much, I figured that for the odd business or motorcycle trip, having the ability to get connected in places I can't get WiFi is a plus.
I'm not currently paying for a data plan, so I won't be doubling services.
I figure the sweet spot for memory is is the 32GB unit. I have a limited number of apps that I carry on my iPod Touch, and don't feel the need to carry every ripped CD in my library, nor a lot of video content.
Like one of the earlier posters, I have been stuck in too many places for meetings, etc. with minutes (or hours) to kill and no access. That makes 3G and $30 a month a no brainer to me. That said, I decided to hold out f a couple reviews and to give Apple some time to solidify their app offerings...
Tony