The tier list is pretty much flawed and since it's a few years old it shouldn't be taken too seriously.
For example a Corsair RM is tiered the same as a Seasonic G although the G is like a quality supply while the RM isn't.
Furthermore Antec has a habit of switching OEMs rapidly, for example the PSUs listed as Seasonic OEMs by Antec are now made by FSP instead and so on...
For 60$ look for a 550W Corsair CXM, Seasonic S12G or S12II, XFX Core/Pro/TS or Antec HCG (Highcurrent Gamer)
If non of these are available for the price tag, a EVGA Supernova Nex or 550b will be your best bet