I don't know anything about the HOT-591P, but I have built around 20 systems with the yoyo 5EHM. It's a decent board but has a few 'issues' you should read about in all the yoyo tech docs. Mainly: 1) be sure to install the 4in1 drivers BEFORE installing hardware drivers (esp AGP and IRQ) 2) Do NOT attempt to use bus mastering, it can make it unstable, DO NOT install the busmaster driver! 3) you must enable USB in bios even if your not going to use it. 4) If you use a high end video card (TNT or Geforce), be sure to add a 300watt (min) PS.
Other than that, it is a good board.