Antec legend is a great press, as you know. I have 6/4 that I got for $2000 with auto flash. Mine is 18 years-old and it still kicks a$$. No issues. Just call Dave at Antec and he'll hook you up with everything you need.
6/6 is a all-heads-down press that you can have 6 people working at the same time. I doubt you will ever need that, if you do, you'll probably have money for auto press and bigger dryer. Also, on 6/4 you can have 2 people working at the same time because you can have 2 diagonal heads down at the same time. (it is not all-heads-down but it is two-heads-down)
Good luck.