A word about opening up. We played two outdoor festivals this weekend.
The first had the best PA I have ever played through. 4 2x18 Peavey subs, 4 3 way Peavey columns with 2x15, mid horn, and tweeter, powered by over 25KW of QSC, Crown and Crest power amps. Great sound, and a great soundman. My rig was just a stage monitor, and it did the job very well.
The second had a decent, but small PA. 2 1x18 Peavey subs, 2 EV 2 way cabs, and two of those JBL plastic 15+tweeter cabs, powered by about 2KW. Again a decent soundman, but we ran vocals and kickdrum only through the PA.
In hindsight, we should have miked the guitar.

My guitarist had to turn his Line 6 150 watt 2x12 up almost all the way. My rig did the job admirably well, loud, clean, and I still had a little power to give.
This little box rocks! I can't imagine how loud a 410, or a 1210+1212 would be.