Blue Dream is a stellar example of a low-anxiety sativa. One of it's parents, Super Silver Haze, is similarly uplifting without the raciness and anxiety some people experience from sativas. Lemon Cheesecake Thai is another one that's energizing without being edgy. If you're in Washington, and can track down some Santa Marta Purple from Kiona, that's another solid strain in this category.
For you heavy indica fans, I've found that Triangle Kush is a particularly stoney variety. They should probably rename that strain "Don't Make Any Fucking Plans."
BD is one of my favorite strains, I've literally smoked pounds of the stuff.