I'd recommend getting something with a fantastic clean sound -maybe even one channel, ad then buying any number of boost, overdrive and dist. pedals for your dirt. I think this would probably be most cost effective. I'd check out Orange, Dr. Z, or whatever you have available. Some good pedals to check out would be a Fulltone Fulldrive 2, ZVEX Box of Rock and ZVEX Box of Metal. The fulldrive will push a clean channel into fantastic overdrive and the Box's will give you great distortion tones.
I would also recommend point to point wired amp -much easier to fix. That's why I think Dr. Z would work well in your case -they are all under 2k, point to point and made in the USA -doesn't get any better than that!
I would also recommend point to point wired amp -much easier to fix. That's why I think Dr. Z would work well in your case -they are all under 2k, point to point and made in the USA -doesn't get any better than that!