I'm eagerly awaiting what I believe will be my first iPad. I will definitely go 3G/4G as I got an extra mobile internet 3G contract for free when I bought my iPhone 4S. I also like the idea of not always having to tether the iPhone-internet to my iPad. I find it more difficult to decide what storage capacity I need. I've always had the 16GB's, in my first iPod Touch, my iPhone 3GS and now my iPhone 4S. When I had the 3GS, I filled all of my memory, as I had lots and lots of photos on it, around 4000 pics, but also my entire music collection and a few apps. When I got the iPhone 4S I still decided to get a 16GB. These days however, I have no need to have all of my music library on my iPhone. Instead I use Spotify which works flawlessly. I can even sync offline playlists for moments when I'm unable to use internet. I have also stopped syncing photos from my iPhoto-library and only store photos in my phone from the built in camera. I was never particularly impressed by watching video on the iPhone size screen, thus 16GB works perfect for me. I also prefer the minimalistic usage, not filling my phone with piles of junk.
For the iPad however, I'm considering getting a 32GB (depending on the price) as I would like to put a few movies on it. A cloud-service for movies would be the ideal thing however, sort of like Netflix. Unfortunately Netflix is not available in Sweden, and the substitutes suck. I would not put music on it and I would not use the built in camera. I was mainly thinking movies, books and internet browsing, perhaps a few games and such. 16GB would be too small I believe.
My main issue is deciding what color to buy. Black or White. The Black one looks like any tablet on the market IMO, hence I might get the white one. It will probably also be easier to keep free from fingerprints. However the black one looks way more classy and would match my iPhone and iMac better. I've bought the black Apple products since my first Apple purchase in 2005, the 5G iPod. We'll see I guess! 🙂