I too only have a 16GB, non 3G model. If anything, that would be the only upgrade I rather wished I had sprung for, but with more and more cell phones more than happy to act as a MiFi, it's a regret I hope to fix without having to buy a new iPad. I always need a new phone, but I don't always need a new $629 iPad.
It also used to be a challenge to find a restaurant or a coffee shop that had free WiFi, but now it's the opposite. You pretty much have to go out of your way to find a place that doesn't. All the airports, all the airlines also have it (it's not like you can 3G on a plane, anyway!) and now even the trains are getting it. Just about the only place left is your friends (I might have only a handful that aren't WiFi?) possibly your parents (yeah, like I was going to stand for that...) and um... there's the woods and the car left. Can't say I need to surf the web while I'm hiking, and as far as the car is concerned... It's probably better that I CAN'T get the internet in there.
Alas, if there's anything I DON'T do with the iPad, it's listen to my music... Or watch one of my pre-purchased movies on, so I may also be the wrong person to ask.
Sure, I could watch Zombieland for like, the eighth time, but now that Netflix is at my fingertips... What I have or don't have for movies on my iPad is purely a non-starter for me. The same goes for my music. Not only do I have all of my music on a network server so I can access it from any number of my computers and laptops at home and on the road, I also have two iPods that (heh) still manage to play music, even without any help from my iPad.
I do have plenty of space left, so if I did want to put Zombieland and a few other movies on it, as well as 250 of my most favorite and most listened to songs, or have room to keep some of my newest CD's on... I could still do that and have plenty of room to spare.
If anything, I would say, "Go ahead and get the 16GB model." And if you're the kind of person that wants to be a passenger in a car and checking their email (or that dude surfing the 'net on the hiking trail) then spring instead for the 16GB, 3G model.
In my opinion, that $100 savings could be doing a lot more for you, other than sitting in your iPad as space you very likely don't need, or can live without. You're only a sync away from putting on the latest movie and music purchases on it anyway.
