Guru is awesome. I use it for nearly all my electronica stuff. I like Battery 3 a lot, too, but it takes a lot longer to compose with. Recently, I've been using the drum rack in Orion, which is very cool. It's a lot like Redrum, but with the ability to set the volume for each hit. The only thing that bothers me about it is that there're only 4 outs. But with the ease of loading and creating sequences it's just great.