Hi all --
Shivering here and looking at the sad state of my boring basics -- so jumped on a great deal for Lord and Taylor's house brand merino cardigans: with code "FRIENDS" $17-20.
Looks like they have Petite, Average, and Plus in a fairly decent range of sizes/colors.
I ordered a merino turtleneck (silky, fine-gauge knit) from the line this summer and it's been in play quite a bit.
Also ordered/returned some of their other house brand merino items that seemd to be good quality -- they might be on sale too.
If between sizing I'd say go for the smaller end of your regular.