My personal favourite is the 180 (faster than the 160, and with an FPU), although I have never met a 190. My two run 7.6.1 happily (with 12 or 14MB of RAM). The rub is their displays. The TFT displays of the 180s potentially will suffer from the dreaded and incurable tunnel-vision, and the 160's FSTN is, well, a passive display. But for its smaller dimensions, the 180c's colour display might be the best compromise/avoidance tactic.
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Is there any sense among members of how common it is for these early TFT displays to go bad? I would love to get hold of a working PB180, but fear the screen problem. A couple of years ago, I bought an untested Duo 280 which turned out to have the tunnel-vision screen. I absolutely loved the screen for the first few minutes after it booted from cold, but each time, it would be unreadable within 20 mins or so. Eventually the machine was used for parts.

Once bitten, twice shy. I was, for instance, looking just tonight at two untested PB180 units on eBay, but decided not to bid because of the screen failure problem.

But if screen failure were not all that common....