>Does anyone have any experience (positive or negative) with either of these
>parts? Are there any other devices that I should consider using?

You can write to the Atmel's RAM buffer at any speed you desire.  I use it
to log data myself (but then, I generate a 256-byte page (no, I don't fill
it completely for addressing reasons) in 16 mS, then flush to flash.  If
you  do your algorithm smartly, you can be writing to one buffer while
burning the other.

I recommend the AT part because I've used it and I'm happy.

Andy

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