Those resistors are a very common failure point, the circuit drives them VERY hot even when everything is working properly. The conventional fix is to replace them with much higher wattage ceramic resistors. You can also swap the driver transistors with mosfet's, which cools them down considerably.

Of all the choices, I'd suggest the PinballPCB above the others. Already has the mosfet change integrated in, among other things I really like about his boards.

-Hans