Additionally with the 8340 it might be possible, budget wise, to also add the 7360 sub. Does this seem like the best bet?
Tough choice, if you want GLM in the monitors, you'll probably want it in the subs, but genelecs subs are such a poor value. $2500 for a single 10"? That's just bonkers, you could fill your room with 4 subs and a hardware dsp solution and still have money left over for all sorts of things. Even four little 10" budget subs placed around the room would eat the genelec alive in terms of bass performance. I really don't how they came up with pricing for their subs, it makes no sense to me.