Well, those brands can be had from cheap to spendy. For example, a great cheap head is a Peavey VTM. I have a 60 that rocks. Add a boost in front and it can do modern rock and metal. Normally you can find these under $300, they would probably need new tubes, so factor that in.
Move to the $500-800 range and you can add the 5150, JSX, Mark III, Single/Dual Rect, Engl Thunder, and maybe others if you're a clever shopper.
After that you may as well consider going up to $1500 for anything Engl, Mesa MkIV, Roadster (maybe...prices on all of these will fluctuate in the used market).
For a cab I'd say Avatar and Lopo are your two best cheap but good options.