Thanks everyone. I think there's a good enough consensus here that the Peavey 410 TVX is what I'll aim for.
As for Ashdown MAG stuff, is it all good? Am I looking only for the valve ones?
As an aside, I'm picking up a Boss LS2 tonight to see if it will help me beef up the low end a bit when I stomp my DS1.
edit: Thinking of this specifically