Zubrowka straight from the freeezer. If I'm making a tall mix with lemon, Stolichnaya.
Many years ago, before flavoured vodkas became popular over here, there was an independent off licence in Hebden Bridge, which used to sell flavoured Polish vodkas; bison grass, lemon and pepper are three which come to mind. He also used to keep some harder to acquire vodkas and other drinks out of sight round the back of the shop, which was a nice touch for regulars.
I was given a bottle of caramel vodka a while back which is in the cupboard, but find my mouth is rarely in the mood for that. Way too sweet.
My Dad's preference was Krepkaya, but personally I found it too harsh. Both my Mum and Dad used to like cherry vodka at Christmas.