For entertainment the Kindle Fire HD is nice.
Again, the office supplies such but only in the 7 inch HD. It's a great display.
The tf300 is a great display, the nexus is a great display (yes, I'm repeating myself.)
The tf300 can be found occasionally refurb for 340 bucks with the keyboard dock. It looks like it gets 14 hours on the dock so that's really out there. It has the quad core CPU and 12 core GPU.