I bought a brand new iPad mini retina 32gb wifi and cellular about 6 weeks ago.
Thankfully I managed to ditch it last week. I bought it thinking that if it's Apple, it's got to be good....wrong in my case. I wish I gone and tried one first.
The layout and text on the browser was incredibly small and I found that if I tried to use it in low light I needed to wear specs, not ideal I'm afraid.
Anyhow I've gone back to a 10" screen, just waiting for the Samsung S to drop in price then I'll grab one of them.
16 GB or 32 GB... If you do pictures are you saying you take pictures with your iPad? If so you will want the 32 GB model so you don't have to worry about running out of space during an outing. You will be able to edit and take movies on the iPad as well so combined with pictures the 32 would be your best bet. Even if you don't take movies it is something to think about.
If you are not shooting any pictures with the iPad I would still recommend the 32 as you are probably editing pictures on the iPad. For this you will need the space to upload photo projects to edit. Realistically, when you get your hands on the 32 you only have about 25 gigs of useable space.
The 16gig model is for people using cloud storage for everything or is only using the iPad for email, web surfing, and books. As those items do not take up that much space.
Since the iPad is a device not accepting to the consumer to upgrade components. Why not spend the extra money upfront and get the larger iPad than kicking yourself for not, when in actuality you need the extra space.
Each to their own ... good luck !