The Forum is probably the best venue I've been to.

Why?

Just the right amount of seediness for a music venue - some places are just too smart.

Perfect size - big enough for a loud crowd but small enough to be close to the performers.

Good layout - you can mosh on the ground level, or get a great view from the balcony.

Great staff - helpful rather than officious.

There is parking to be had, on street nearby. The car parks they recommend are down some pretty dark streets so I avoid them.