I would generally stay away from boutique parts, and prefer instead industrial stuff I can get the full data and specifications on( and interpret the need as best I can to compare to published specs ).

For example:
The plate load resistor only needs two( one for each channel ) so even an expensive one is not going to make a big dent in the budget if youy spend $6 each....

You can contact Pete for direct assistance( I would hope ), and discuss it with him. Or you can call me, as I speak faster than I type.
cheers,
Douglas