Extremely difficult for me, as I've had the pleasure and honour of booking loads of bands I love, but:
1. Warning - nothing even comes close to the devastating impact of these guys. 2. Gama Bomb - top mates, top tunes, and great live energy every time. 3. Dark Forest - although I've joined them now, at the time I was overjoyed to find a local band that I truly loved, and they were killer live. 4. Enforcer - just a heavy metal attack! 5. Hell Militia - although I was 'distracted' at times during their set, it was really sick, and exactly what black metal should be!
Other notables for me include Salute, The Lamp of Thoth, Imindain, Nocturnal, Mutant, etc.
Very tough for me also, as like Billy I've had the honour of booking some of the bands that are my personal favourites anyway. i think my favourite three have probably been: 1. Sirocco 2. Gama Bomb 3. Warning After that it becomes incredibly hard to choose - The River, Lamp of Thoth, HOD, Dark Forest, Battlewitch, Anoxia, Serpentcult, Nocturnal, Enforcer etc etc