Logitech Surround Sound Speakers Z506 or Logitech Speaker System Z623

I know that one is 2.1 and one is 5.1 but i plan on getting something cheap like this for now until i get some more money to build my own system until then this will hold me over. So which one would hold me over or are there some better suggestions out there. Also i don't know anything about the build quality of logitech speakers i know the keyboards and mice they make are awesome since i have both a keyboard and mouse from them but i dont know about speakers.