What transaction level should I use?

Hi all;
I have a nightly daemon that bills all customers who's monthly bill is this night. For a given customer, in a transaction I verify that they still have not been billed, run the charge through paypal, update their record based on the results of the charge,
and then commit the transaction.
I do a distinct transaction per customer but that paypal part can take awhile (we have the could hit of paypal times the cloud hit of Sql Azure). The only time there will be a rollback is if an exception is thrown. So if I write my code correctly - never.
During this time we could well have some selects against that same record. But it's very unlikely we'll have an update.
What IsolationLevel will be best for this case.
thanks - dave
What we did for the last 6 months -
Made the world's coolest reporting & docgen system even more amazing

Hi,
Choosing the appropriate isolation level depends on balancing the data integrity requirements of the application against the overhead of each isolation level. The highest isolation level, serializable, guarantees that a transaction will retrieve exactly
the same data every time it repeats a read operation, but it does this by performing a level of locking that is likely to impact other users in multi-user systems. The lowest isolation level, read uncommitted, may retrieve data that has been modified but not
committed by other transactions. All of the concurrency side effects can happen in read uncommitted, but there is no read locking or versioning, so overhead is minimized.
More information :
http://msdn.microsoft.com/en-us/library/ms189122.aspx
http://social.technet.microsoft.com/wiki/contents/articles/1639.handling-transactions-in-windows-azure-sql-database.aspx
Regards,
Mekh.

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instead i got year is 1 ??? (for present year !!) ...
it does the same as hour and minute... i dont have the exact time like the time in my win task bar.. plzzz help me...

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* Calendar Demo (by Sun, with modifications)
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        System.out.println("HOUR: " + calendar.get(Calendar.HOUR));
        System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY));
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What transaction level should I use?

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