Chris is the chap to give a valid opinion on the relative merits of Reds & Golds. I don't think I've knowingly listened to any Reds. There is information online outlining the differences & I suspect such differences that they are will mean that perhaps Reds suit one style of cabinet better than Golds & vice versa with another cabinet type.

Either way if you choose with your ears (and from the good starting point that either type of driver offers) you shouldn't go far wrong. The rectangular GRF's are certainly a deal more manageable in terms of size than the corner units but must miss out on a little LF extension. Either will give far better coupling to a room than any reflex loaded arrangement and would be my preferred choice as a result. Again, perhaps not quite as much bass extension as a ported design but what there was would be much more natural sounding as the driver excursion will always be less for a given spl.