This year we've gone from Stoli's to Grey Goose for our Tini's.
You can taste the difference.
BTW if you get a chance to try Black Lab Vodka, do so.
This is a U.S. made micro brand, made to compete with the likes of Grey Goose and Belvidere.
Even in the States it's hard to find - available in MN but not WI.

Here's another Martini trick I learned this year, that's great for extra dry's.
Shake the shaker vigorously until your fingers start to hurt.
They hurt because the cap of your shaker will frost over.
This gets a lot of ice crystals into your drink and really chills those bad boys down.
Try it, you'll thank me later.