My experience was as a nearly-40-year-old when I moved to a new neighborhood last fall
click here for way more than you want to know about how bass frequencies can easily invade your neighbors’ homes. That’s also a good example of how threads in here can go, since it would appear you’re new both to bass and this forum: a few jerks, a few jokesters, a few well-meaning but misinformed or tone-deaf people, but mostly people who love to talk bass and do know a thing or two—or music and equipment inside and out, in many cases. Read critically and you’ll figure out who’s who pretty quickly. Welcome!
More wattage
is more power, but a 1,000 watt amp is not ten times louder than a 100 watt amp with the same speaker(s), if they can even use the same speakers. Speaker area has a lot to do with volume, too, and we’ll very quickly get over my head if we go much further. It only took 200 watts through 1x15 at what I thought was a reasonable volume to disturb my neighbors

so the short answer to your wattage-weight-power question is that wattage alone doesn’t tell you much. Anyway, those 1,000 watt amps do have volume knobs
$100 can get you a lot in either a dedicated headphone amp or an older combo amp. Older gear weighs A LOT more than newer gear, and older people with older backs continue to happily sell that stuff cheaply as they move to newer lightweight gear. If you don’t mind hefting it and you can fit it in your room (they make great seats!

) an ‘80s or ‘90s Peavey TKO with a headphone out would serve you well, and that’s just one of the more ubiquitous options among the many perfectly serviceable amps from that time period still floating around.