Laney GH50L or GH100L (50-watts / 100-watts) virtually are a JCM800 on steroids. If you like Toni Iommi, then this should be your amp... that's his current rig. However, Iommi still uses the JCM800 on occasion.
The price for a Laney GH50L range from $500 - $650 ish. You can also get a 2-channel, 100-watt with reverb version in the VH100R @ about $800 - $1000