Gigging amp

Hey guys, I’m looking to upgrade from my Boss Katana 50watt solid state into something louder and have a few questions. The first being whether I should get a head + cab or combo. The second question is what are some good recommendations for either. I’m looking to spend less than $500 usd or $800 ish Canadian. I’d probably want something in the 100W solid state or 15W tube range. I play a lot of metal and punk so I’m looking for something with a lot of gain. I’m also open to used or new. Any help is appreciated. Thanks