I'm looking to buy a new amp/cab for studio use and session jams.

It has to have a really powerful kick-ass heavy distortion for rhythm parts and MUST also have excellent variety of tones for lead.

I currently have a Marshall 100DFX, it's a great amp but I'm looking for something with an even more aggressive crunch and a different lead tone.

My current choice is a Mesa Boogie Dual Rectifier... Anyone got any constructive feedback on this hardware or can anyone suggest anything "better"? Pricing is not too much of an issue.

Cheers