I need to replace my Nokia 8290 soon (dropped it two times too many in San Fran last month). No other manufacturer makes an interface to rival Nokia yet, IMO.

Get the Sony Ericsson T68i. It's about the same size, but better voice quality, longer battery life, and tons of useful features. Getting used to the UI does take a bit (took me a week coming from the 8290), but it's well worth it. It will read the SIM out of the 8290, but any caller groups will be lost. Setting them back up is pretty quick though, because Nokia used special characters in the name field to group them (thus all the people with $ are in one group, & in another, etc...).