_Tom_ gets a good Slash-y sound out of his GH50L with Mules, I used my GH50L in my AC/DC band so it does Angus and I'm pretty sure the Jake, Zakk and Jimmy tones are in there too. The GH series has been described as similar to a JCM800 Marshall, so I don't think you'll go wrong given the tones you're after.
Buy it and enjoy it! I miss my GH50L...