You could go metal w/o doing a high gizmosity Stanley 45. The Stanley single
purpose 48 and 49 T&G planes work quite well. You can't lose the mate. It has
rotating fence -- cut the tongue, rotate the fence, cut the groove with the same
plane. Union made very similar which usually sell for less. Often found w/o
cutters but repros are available from St. James Bay -- which is oddly in the
desert. Or plane No.s 48 and 49 are available new from a Maine-based supplier
If you like to pay more.