The Xoom has just come down in price to $499 (I actually got mine at Staples for $449 using the [newspaper ad] coupon for $50 off. That's for 32 Gbyte with a working SD Card slot and USB. It makes for a nice ebook reader (I use Cool+ Reader for Android) with its 10" screen.

IMHO, it's the best build quality of any tablet (and I've had the Acer and an IPad) although slightly heavier than either. Also, It was just updated to Android 3.2 by Google and that now makes it capable to run a mouse.

You might want to look into the XOOM - I went to it from a Samsung Galaxy 7" Tab (that I also thought was very well built).