I've never used any plug ins for drums but i use the drum loops from beta monkey.It's not free but a disc is only about $20.Each disc or download comes with anywhere from 500 to 800 samples.They have all genres and it's samples of a real drummer playing,not a robotic sounding drum machine.I've used drum machines in the past and in my opinion this is way better and more realistic sounding.I just insert my discs,import the loops i want to use into sonar and arrange as i please.