The Fitted Merino Wool V-Neck Sweater from Express looks to be the staple wardrobe item for this coming fall/winter. Quality is there. Colors are there. And, quite possible most importantly of all, the fit is there as well. Layer them on top of a basic button-down shirt and you'll make the outfit look at least twice as good.
They're a bit pricey at their current $70 price tag, but wait for a sale and you'll be able to get them for a much more reasonable $40, if not better. Just — as with all sales — don't wait too long or they probably won't have the colors or sizes that you'd need.