for me the sata hdd ssd is the better way in add of the sd card reader. You can plug the ssd outside with sata cable as you said : and more now you the ssd is less expensive than the CF for a huger capacity. And last thing put your ssd outside is more simple to unplug it and load game/remove games with your computer. You can try to contact the dreampsu builder, I know he has already received a lot of requests. Maybe if he has some more, he would build others dreampsu again.