Using OR in SQL clause

Hi,

I have a sql query looking like this:

SELECT o.orderID, o.invoiceID, o.customerID, c.firstname + ' ' + c.lastname AS Name, o.invoiceDate, o.PayDate, o.ocr, paymentStatusID, orderStatusID, ISNULL(printed,0) AS printed, currencyID, paymentTypeID  
FROM orders AS o INNER JOIN Customer AS c ON o.customerID = c.CustomerID  
WHERE (o.invoiceID > '0') AND (o.orgID = 11) AND orderSaved = 1 AND o.orderStatusID > 0 AND (old IS NULL OR Old = 0) 
AND orderStatusID = 5 
OR PaymentTypeID  = 12
ORDER BY CONVERT (BIGINT, o.invoiceID) DESC

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The problem is now that when I use the OR keyword it chooses between this clause:

WHERE (o.invoiceID > '0') AND (o.orgID = 11) AND orderSaved = 1 AND o.orderStatusID > 0 AND (old IS NULL OR Old = 0) 
AND orderStatusID = 5 

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and this:

OR PaymentTypeID  = 12

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I can solve this by doing like this and this reflects the result I really want.

SELECT o.orderID, o.invoiceID, o.customerID, c.firstname + ' ' + c.lastname AS Name, o.invoiceDate, o.PayDate, o.ocr, paymentStatusID, orderStatusID, ISNULL(printed,0) AS printed, currencyID, paymentTypeID  
FROM orders AS o INNER JOIN Customer AS c ON o.customerID = c.CustomerID  
WHERE (o.invoiceID > '0') AND (o.orgID = 11) AND orderSaved = 1 AND o.orderStatusID > 0 AND (old IS NULL OR Old = 0) 
AND orderStatusID = 5 
OR PaymentTypeID  = 12
AND (o.invoiceID > '0') AND (o.orgID = 11) AND orderSaved = 1 AND o.orderStatusID > 0 AND (old IS NULL OR Old = 0) 
AND orderStatusID = 5 
ORDER BY CONVERT (BIGINT, o.invoiceID) DESC

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I wonder however if there is a smarter way to use the OR keyword so I don't have to repeat everything in the WHERE clause every time I use it?!

Thanks for help!

Peter