Update; £100 to double the storage from 128GB to 256GB = worth it.
Cellular adds £150... more complicated. I currently have the 11" WiFi and Cellular. Great. If I get the 12.9 WiFi only, I can use my 11" when travelling (hardly ever, but...) and leave the 12.9 at home.
But...what if, after a while I find that I'm not using my 11", as the 12.9 is so much better? So, I decide to sell the 11".
Now, I am left with my new 12.9 WiFi only....Would I now regret not having the cellular?...
The main consideration here it seem to me is the use of Cellular. I've never really used it, but, like my alarm system in my house, I haven't either....
Sorry for "working out" my considerations here but your advice helps.