Ok, so i've done lots of research on tube amps and i've decided on four tube amps im choosing from. 1. Mesa Boogie 400+: Sounds pretty good and most people seem to perfer it over other tube amps. I'm just kinda worried because I wonder if 6L6's will sound good for bass, being guitar tubes and all. 2. Mesa Boogie 400: I like the sound of this one, because you can interchange 6550 tubes and 6L6 tubes also. Supposedly sounds like an SVT-II when you have in the 6550 tubes, but cleaner and punchier. 3. Ampeg SVT-II: I have heard this one sounds like the modern SVT-2PRO but is 100x more reliable. I also think this one will go good to match my Ampeg 810 cab. 4. Ampeg SVT (vintage, Maybe MTI Era?): Classic vitage svt. Not much more to say. Out of these four, which one for lets say Glassjaw/ Thrice/ Mars Volta styled music?