Mesh
Zargg
Good evening, lads 
I've been playing some geetar, and playing with amp sims for a couple of hours.
Not too crazy about any of the amp sims I have, so I downloaded the UAD Marshall 2555 (what I used to have).
Compared it to the IKM Slash 2555, and the UAD was way closer in sound.
Not good enough to buy it, though.
The search continues 
Have you checked if GR5 or BIAS AMP Pro (you can match/build the tone of the amp you want) has anything to offer?
I don't have BIAS AMP (just the FX Pro), but I've heard good things about their amp matching feature.
I only have "LE" versions of both.
Might have to check some demo's I can't afford yet