Now we're talking. That's a nice budget for a 4 speaker system that can be pieced together and will smoke any kit setup out there. A shining example of buy once cry once, well except for the boom 2 mistake but you get a pass for that as a relatively new member.
There are some good videos here and a bunch on the other forum. Listen to them with headphones on and see if a couple stand out more than others. Of course the video isn't as good as the real thing, but there's a good chance you'll hear something you like the sound of and will get you pointed in the right direction.
Even though the lowers will help provide fill, the fairing still needs to be your top priority for riding at speed and the amp is the heart of the system. At that price point your amp and front fairing must be top notch. If that means less than primo speakers in the lowers so be it.
Freedom isn't free, remember to thank a vet.
2018 CVO RG lava orange, 117 Stage 3, 14" F47 and a few chrome extras. Boom crap gone.
2016 RG Special Cosmic Blue, 120ST with Dragos 2:1 and TTS tuner, FBI drop seat kit and JNR air ride. Stock audio long gone.