Okay, so I've been using a GK Backline 112 combo with GK 410BLX-II cab for quite a while now, but there was one concert when my amp just... I don't even have an idea, it turned quieter and started developing some fart noises. I took it out of the combo, looked at it, put it back in as nothing seemed to be out of a natural state of things and surprisingly - it worked. Anyway, I dunno how long will it work, so I need to get a head for my little big cab. I am really pleased with the Backline sound, it gives me a nice little distortion based on how dynamically I play it and that's something I look for. But my favorite bassist of all time was using SWRs. And I mean Tim Bogert, the legend of rock. So here it is, I can take GK Backline 600 for about 220US$ or SWR Studio 220 for 280US$, or SWR Basic 350 for also 280US$. (I live in Poland so the prices are kind of different) Anyway, straight to the point now, which one is better, which one is louder and which one will rock my socks off? Edit: Forgot to mention that I play 70s hard/blues rock.