Get-ADUser SamAccount from CSV file does not work.

Question

So I'm trying to get HomeDirectory + SamAccountName using Get-ADUser from an imported csv file called $csvFile
$GetUserInfo = Get-ADUser (Get-ADUser -Filter { displayName -eq $csvFile[$index].DisplayName}).SamAccountName -Properties SamAccountName,HomeDirectory
It gives me an error. 
Get-ADUser : Invalid type 'System.Object[]'.
Parameter name: displayName
At line:1 char:28
+ $GetInfoUser = Get-ADUser (Get-ADUser -Filter { displayName -eq $csvFile[5].Disp ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Get-ADUser], ArgumentException
+ FullyQualifiedErrorId : ActiveDirectoryCmdlet:System.ArgumentException,Microsoft.ActiveDirectory.Management.Commands.GetADUser
However if I do like this 
$DisplayName = $csvFile[$index].DisplayName
and replace $DisplayName to the filter like this, it works flawless and I get HomeDirectory and the SamAccountName
(Get-ADUser -Filter { displayName -eq $DisplayName }).SamA...
Any ideas or improvements

Answer 1

Still produces the same error. I'm running 4.0
How about this?
Import-Csv C:\Temp\user.csv | % {
$displayname = $_.displayname;
get-aduser -filter { displayname -eq $displayname } | Select SamAccountname , HomeDirectory
The below was my CSV format
DisplayName
Chendrayan Venkatesan
Ramesh Venkatesan
Regards Chen V [MCTS SharePoint 2010]