Nielsen- Massey madagascar bourbon vanilla extract! I've been using it for years and it really makes a huge
difference. ( I have never tried the Penzey's).
It used to be a specialty store item, but it's now available much more widely. I swear I saw it at Trader Joes in the large bottle, they carry at WSonoma, and I would guess that they have it at The Cooking Cottage. You can buy it on-line from King Arthur Flour http://www.kingarthurflour.com/shop/items/madagascar-bourbon-vanilla-extract
& Sur la Table. The company also makes other specialty extracts ( orange, lemon, etc) that are VERY good and alot less expensive than the vanilla.