Since tomatoes are the star here, choose a super flavorful variety, like Cherokee Purple, Black Krim, Beefsteak, Brandywine, Sun Gold, Black Cherry, Sweet Millions (or better yet, a mixture of several). If you don't mind the color of your drink, use the maximum greens called for (you won't taste it - it will simply color the juice brown instead of deep red). If you're preparing this in the off-season, use grape tomatoes, which are the most reliably tomato-y tomatoes in the winter.