In this picture,
http://farm2.static.flickr.com/1186/...2be230.jpg?v=0
The other guitarist is using a Bogner Shiva.
In this picture,
http://upload.wikimedia.org/wikipedi...06_cropped.JPG
It appears it's Bogner Shiva and then a Badcat amp of some sort. Hard to tell.
I own one so I can comment, but that clean, distinct crunch is pretty easy to get out of my Orange AD30.
I don't think the marshall DSL's would be where I'd turn first for that type of tone.
As for Real vs. Sim, if you don't have the room or the amp, then I suggest using Digidesign Eleven. I use the plug in version and I find that when you blend different amp tones using separate tracks, you can get some great sounds. I'd start with blending an AC30 and a JCM800 and see what that gets you.
Problem with that type of tone is it typically takes volume to produce. Not a large amount, but a cranked AC30 isn't a quiet amp. Neither is an AC15. If I were to turn up my Orange AD30 and 2x12 cab, I'm sure the neighbors would be rather pissed.
My suggestion is to use the amp sims. The Eleven rack is a good suggestion, or if your budget allows, try the Fractal AxeFX.