help with code and ssis package

I have a issue where I should compare data from files to the table and overwrite the row if I find the customer's first name, middle name, last name and address match. If it doesnt match I will have to append the row from the file to the table.
What would be the best way to achieve this, please suggest. One issue is two of the files are csv and two are excel.
And also, when inserting to the table I need to include a datestamp as well.
Table and file structure:

BATCH_NAME |      CLIENT_ID    |      FIRST_NAME   |      MIDDLE_NAME   |      LAST_NAME   |      SUFFIX  |      ADDRESS_LINE1      

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Michael FowlerSolutions ConsultantCommented:
One way to do this would be to use a Lookup.

As for the different files you could transform the data and feed it into a staging table before getting to this step.
Vitor MontalvãoMSSQL Senior EngineerCommented:
One issue is two of the files are csv and two are excel.
That's not a big issue.
Use SSIS to accomplish this. Import data for the files to new tables and add to that tables the date stamp.
Second step is to compare data from the new tables with the existing ones and then update or insert depending on the situation.

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Microsoft SQL Server 2008

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