Check out the Toshiba Thrive. It has some of the same features as the Asus Transformer but is cheaper. It just came out in July.
It is a 10.1 screen.
It has a full-size USB port, so you could attach a hard drive or your own keyboard.
Full-size SD expansion card slot.
User-replaceable battery for $80.00 at Toshiba and $70.00 at Amazon. Toshiba claims battery life of 11 hours but per the reviews there seems to be a wide range, from 6-1/2 to 14, so it's hard to say about that.
Has a file manager.
Has Wi-Fi.
Has Bluetooth.
Can print over a wireless network.
Uses Honeycomb 3.1.
It comes in 3 different sizes: 8 gb, 16 gb and 32 g.
The 8 gb is $396.06 at Amazon.
They just lowered the price of the 16 gb to $399.00
32 gb $489.99
Comes in black or white.
It also has 2 different docking stations available if you need more ports.
http://www.amazon.com/Toshiba-Thrive...5163923&sr=1-2
http://us.toshiba.com/tablets/thrive/10-inch
I just ordered this, so I hope I made the right choice.