I have some questions about mixing cab and head brands: 1. Which heads by certain brands pair well with cabs of other brands? 2. How can I know? 3. Are differences significant enough that you should rather stay within the brand of the head? 4. Does it come down to speaker type? Like, does an Orange pair best with any brand that has a Vintage 30 speaker? Not? 5. What info do I need to know before crossing brands? 6. Which brands definitely do NOT mix well? 7. Or... are these stupid questions and it really doesn't matter, i.e. any pairing works? For example, which cabs of other brands would go well with a Mesa 800 or Orange OB1-500? Would an Ampeg SVT15E work well with either? A Fender Rumble 115? Is the price disparity worth it? Please don't say, Mesa with Mesa or Orange with Orange. I am curious to know which other brands will be equally good. And it's not a question of budget, it's a question of learning how to do the research, i.e. what to look for when shopping.