i'm 5'8" -
for winter- i go with a full length hammock gear winter incubator. no muss, no fuss. i know i'm getting total coverage when its 5 degrees and staying warm is a very real concern.
for 3 season- i go 3/4 hammock gear 3 season phoenix. offers enough coverage when the temps approach freezing and slightly below. i have a gossamer gear torsolite pad that doubles as my mariposa plus back panel and foot pad to complete 3/4 uq.
for summer- its the 2/3 warbonnet summer yeti. when temps hover around lows of 45 and above, the weight and slightly smaller size can't be beat.