Just did a quick look and if you check farnell for 3 wire through-hole EEPROMS you get:
So I'd say it's close between the first two. This page implies that the DS2433 it may be EOL, but I think the DS24B33 isn't.
Hopefully they're very similar in terms of protocol though.
Microchip do some really nice, really cheap ones, but while there are supposed to be through-hole versions available, you don't seem to be able to buy any of them :(
It'd be a very handy little add-on board though.
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