Choose service account?

In the related question, I'm following steps to configure reporting services.

The first screen is "service account". I get a radiobutton "use built-in account" and "use another account".

I'm not sure which one to do. If i use "another account"...then what domain/user should I use??
                                              if I choose "built-in"...then i have the option of "local system", "local service" and "network service". Which one to choose?

Note that I have the database R2 installed as login of "LocalSystem". Not sure if this matters
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The default is Local System during the install.  This will function properly but is less secure than creating a service account for sql.  

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In usual Prod kind of environments, there are special Windows based domain accounts (known as service accounts) created so that all important services like reporting services or integration services could run under those accounts. I am not sure for which environment you are trying it. If you don't have any special Windows domain account created for the purpose then either get created one or run your reporting services under local system account only.
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Microsoft SQL Server

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