My favorite ones are at Landsend. Now, before you scoff too loudly, hear me out. Many of their tees are not what I'm interested in, but they have one that's great. It's a cotton/modal/spandex mix that is fitted with a nice scoop neck. I have 3 colors and love them for layering. The neck is nicely finished and doesn't feel like an athletic tee to me.
http://www.landsend.com/pp/Lig.....038;sku_0=::BFJ&CM_MERCH=IDX_Women-_-KnitTopsPolosTurtlenecks-_-ShopByFit&origin=index
Oops!!! I missed that you wanted V-neck. Sorry about that. I'll leave this here in case anyone else is interested in them.
They have the same fabric mix with a v-neck but I haven't tried them:
http://www.landsend.com/pp/Sho.....038;sku_0=::TLG&CM_MERCH=IDX_Women-_-KnitTopsPolosTurtlenecks-_-ShopByFit&origin=index