Again, just 3? That's tough!
2:BMBH, especially in combo with #1
3:MMP ( I just can't do only 3: tied for 3, WB Yeti like CS torso quilt, only ~9 oz with just 1 layer used and good well into the 50s plus resistant to moisture/condensation)
There's still more, but that is 3 with a tie for 3rd. Though not really, it's 3 but not in amy particular order, it's all great gear.