... yup, understood completely ... thats why a lot more people dont have (or keep) the B1500 ... however, according to your earlier posted criteria:
.. combined with your thread title:
"Bigger bang for the buck??"
.. and no mention of cabinets you intend to use, you might need to consider impedance of the cab/cabs you intend to use with this head you purchase ... the MB500 is only 350 watts at 8 ohms, so to get your
minimum of 500 watts, you are into at least the MB800 if you have an 8 ohm cabinet ... at $499 for the MB500, and $699 for the MB800 ... $300 for 700 watts at 8 ohms, and 1250 watts at 4 ohms and then the ability to never really have to worry about running the head below a 4 ohm impedance allowing you to use pretty much any cab or combination of cabs that hit your fancy ... is a pretty major bang for the buck !!
I have no agenda for what you choose, but playing punk and metal and loving LOUD, just be aware going in, that the ratings you usually see on amp heads is for running at their lowest number suggested impedance ... if you go for a rated 500 watt head, you need to run a 4 ohm load to see that ... also, consider that some class D heads do not sound the most desirable pushed into an overdrive situation, so you will often see those purchasing class D power opting for more power to assure a clean headroom ... certainly your call,but with a title of 'More Bang for the Buck', it is probably not going to happen in the highly sought after group of 500 watt class D micro heads ... JMHO