The Nexus 7, Galaxy Tab 2 or NookHD+
Google Nexus 7" Tablet (Jellybean) with 16GB Memory (no expansion slot) - (Refurbished) - $149
Samsung Galaxy Tab 2 with WiFi 7" Touchscreen Tablet PC Featuring Android 4.0 (Ice Cream Sandwich) Operating System 8GB (expansion up to 32GB)- (Refurb) - $147
I'm not sure if this really should be in this conversation but I don't have a real reason not to consider it at that price.
Nook HD (unspecified Android), 16GB (with expansion slot) 9" 1080p screen - $149
What say you?