hehe!! oo nga!! U.S. boys....please read....
US boy here, hehe. Ok. Heres my take on it.
1) DS-1 Keeley mod, I have. Like what Markflo said, "MARSHALL IN A BOX". Pretty cool for crunch and lead but not chug-a-chug-a sound. Mainly classic sound with an edge to me. From tame to angry with a twist of your guitar volume knob. Kinda like a modded Marshall.
2) Metal Zone (MT2) Keeley mode, I have. 80's metal to grind core nu-metal. Heavy chug sound. You have to listen to this pedal in a higher volume setting to get the real feel of it. You said yo have the GE7. I use the GE7 as a booster and to tailor to sound at the same time. I usually add a little bass to the boost/lead setting.
3) ValveBoy. I tried that out and I must say, It's a good pedal for it's purpose. From clean to nasty. You can get a real high gain grind nu-metal sound. Similar to a Mesa Rectifier. The only thing I noticed is that it adds too much bass to the sound. Some people like it, others don't. I'd go for this but it's too expensive for me, hehe.
4)Demonizer control. Haven't tried it yet so I have no comment.
5) BBE Boosta Grande. Haven't tried it yet so no comment.
When I'm not able to use my own amp I use the DS-1 - MT-2 - GE7 combo. I get a wide variety of sound. Fulltone Fulldrive 2 is another dirt pedal that I encorporate with my setup but that's a whole different story.
ALL THAT'S BEEN WRITTEN ARE MY OPINOINS ALONE AND NO ONE ELSE'S. THANKS, HEHE