Recently picked up a Huawei Joy (aka Vodafone 845) for ~$US135 and slapped an 8Gb microsd card in it for another $US20. Compact android nice screen, 3g, wifi, gps, bluetooth, gps, microsd slot, 3.2megapixel camera... wow is it awesome. Also found graffiti is available for android (old hand writing recognition thing from the early palm days) for free... it just made this device perfect.
Liked it so much I got my wife one. Some people think the screen is a bit small but imho it's just right, plus the graffiti recognition makes the need for a keyboard - physical or virtual - redundant.
I've also picked up a Haipad (Chinese) M701R, 7" slate, not 3G, but wifi, hdmi out, microsd slot etc. I use the wifi tethering on the phone when I want to surf on the tablet. Means one SIM... one data plan.
I've finally retired my 6 year old treo