I just redid my 2.5 sohc with gaskets from All Wheel Drive Auto. They sell Six Star brand gaskets and they are actually better than the OEM. A little more money but I mean if you think about it Subaru quality head gaskets is why your replacing them now...
Also if your replacing your head gaskets, be sure to do wires, pugs, timing belt, water pump, and as many sensors as you can.