I reckon the PB170 is a good choice. Fast enough for 7.6.1 (mine runs this with a stripped down version ~ 2.5MB RAM), active matrix screen, easy to pull apart, durable and reliable. The washed-out passive displays of the PB14x/16x wrecks what are good machines, there is of course the PB180 but that seems fairly rare.

Keyboard seems good too - much better than the slushy Duo one

JB