I'm a bassist in an up and coming metal band, and I'm trying to choose between buying a Yorkville XS400H or an Ampeg SVT-350H head. I'm a tube junky. I love tube warmth, tone, and sound. But in my situation, I need solid state reliability. So I'm trying to get a combination of the two. I play a Fender American Deluxe Jazz, and I love it because of its sound, comfort, and versatility. Those are the same qualities I want in my head (excluding comfort). The XS400 has 400 watts (solid state) with a tube pre-amp and a tube overdrive. The SVT-350 has 350 watts of MOSFET technology that supposedly has an extremely tube-like sound. If anybody has any experiences, advice, or thoughts on these two amps I'd really appreciate it.