Need guidelines on deciding over varchar or nvarchar

Hi All,
I need to know following information regarding sorting.
1. Is linguisting sorting possible for char, varchar columns ? Or it is only available for nchar, nvarchar columns ?
2. Performance wise which would be better (with the constraint that my database character set is already utf-8) - char, varchar columns or nchar, nvarchar columns ?
3. I have some database colums, of varchar datatype, which presently store iso-8859-1 characters. In future they are going to store asian characters also. My database character set presently is utf-8. In this situation will it be better to change the datatype of these columns to nvarchar or increasing the length of the columns by 3/4 times should be better choice ?
Any input/pointer would be highly appreciated.
Regards,
Sourav

Hello,
Before I forget you should take a look at the whitepapers on Globalization home page at:
http://www.oracle.com/technology/tech/globalization/index.html
Linguistic sorting is supported for varchar and char columns. Performance wise you may do better migrating your columns to your UTF8 database versus using extra NCHAR columns. You can expand the column sizes as needed to store Asian data as you said by a factor of 3 or 4, or you can use character length semantics. Should you decide to use character length semantics I would advice to do it for the entire database and not just select columns. You can read more about character length semantics in the Globalization Suport Guide.

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Need guidelines on deciding over varchar or nvarchar

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