Honestly for Classic at this stage I'd have thought GDKP would be best.
You bid gold on the item whoever bids the highest pays for that item. At the end of the raid all gold generated this way* is distributed evenly amongst attendees. People who suck at making gold will have enough within a few raids to bid for an item they want.
*If its a pure guild run every week, a tax could be applied to pay for the MTs flask of Titans; but that's about it.