does the Roland Cube sound anything like the Marshall JVM, in terms of high gain (i.e. 80s Speed Metal) tone ?
no. I mean none. You can get high gain out of modeling amps but their models are not going to sound quite like the real thing.

What are you meaning to do with the amp? for practice it'll be enough. I like the vox valvetronix series a lot.
Prs se Holcomb is the answer
Vypyr Tube 60 sounds pretty good for the price.
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What the hell is a G&L.

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Gay & Lesbian I think, the box smelled funny
Greg what did you send me??