Also look at the Sony Readers: PRS-350 (5") PRS-650 (6") and PRS-950 (7"). The 5" might be a good choice if a smaller size is desirable.
Borders sells the Kobo Reader, which is basic but inexpensive.
The only other semi-realistic E Ink option in the US is PocketBook, e.g. from
Dunlin's Books.