I go about as far back as you can with Windows mobile devices.
The first was a Sharp Pocket PC
Then I got a Compaq iPaq, with the compact flash card sleeve.
HP purchased Compaq and I bought a slimmer iPaq with a built in SD slot.
The last non-phone device I had was a Toshiba Pocket PC. I purchased a third party aluminum flip cover that you taped to the back of the thing.
After that, it was...
Samsung Blackjack
HTC Touch Pro
Samsung Focus
Lumia 920
Lumia 1020
I'd like a 950, but the 1020 is still chugging along with the Release Preview installed.