Stuart, Mike, et.al....
OK, I just placed the order with Tom, albeit slightly different than my original plan. Since I reverted back to my original idea of using the bivy, the Arc Alpinist was just too warm. I decided on an Arc Specialist, made to my 6'1" height, Epic exterior, 1oz taffeta interior, with a 1oz overfill. Even with the bivy weight this is only 2.5oz more than the Alpinist with no bivy.
This choice will also allow me to have a 3 season hammocking quilt as well, so it will be dual purpose.
(I guess I can count this as my Christmas)
Thanks everyone for your contributions to my final decision.