Out-File for loop help

How can I use Out-File for something like this bit

$Computers = Get-Content -Path c:\computer.txt

foreach ($Computer in $computers)
{
    Get-Service -DisplayName "*Spooler*" -computer $Computer | select MachineName,DisplayName,Status | Format-List
}

If I add | Out-File C:\whatever.txt to the end of the Get-Service command it will only leave me with the last server on the list. If I use the -append command it will also just add to the file.

Is there an easy way to take all the results first and then output them to a file? Basically I want it to overwrite the .txt every time it runs instead of using -append...

Hope that makes sense and thanks in advance.