Mesa Boogie DC-5
you can find 1x12 or 2x12 combos that are louder and nicer than a Marshall Stack. Prolly can find them for $500 to $700.
I have a DC-5 head that i run through a Mesa recto 4x12 on top of a Mesa recto 2x12 and its sooooo fucking loud. I like my DC-5 better than a Dual Rec and escpecialy Marshalls...but MOST (not all) Marshals just cant cut it for Metal.....and im NOT talking about Preist, Zakk, Maiden, EARLY Metal...but Newer Dirtier Sounding thick Distortion Metal. Just my opinion for what I play.