This is really fun, it will say whatever you type! It was a really simple 20 minute script I made, here ya go!
function Start-Speech()
{
$voice = new-object -com SAPI.SpVoice;
while($true)
{
write-host "->" -NoNewLine;
$msg = read-host;
$Voice.Speak( $msg, 1 ) | out-null;
Clear-Host
Write-Output Last-Said:[$msg]
}