One nice thing about the Bloody Mary is it's easily adapted to the tastes of fire eaters, lovers of spicy food, and people who like the kick but are tired of drinking hot sauce. Tabasco sauce is only used in this because it's a name brand and markets itself in that niche. If you like heat, use hot sauce instead. Other people have mentioned horseradish and Absolut Peppar, which do similar things, but why not go all out? Go for the burn!