Hello & Welcome RPG!
Nice intro & interesting history. I am delighted that someone in their early 20's is still discovering the fun side of surround sound & music. When you get a chance how about sharing what music you like & more details on your current gear? You are in the company of enablers, er, friends that will certainly be glad to help you expand both.
My current setup is a Realistic QA-681 Amp with a pair of Baby Advent IIs in the front and some Polk Monitor 40 Series IIs in the rear. Turntable is a modified AT-LP120-USB (the usb and preamp board has been removed) with a VM540ML cartridge. For quad vinyl decoding I have a Sony SQD-2070 for SQ and a JVC 4DD-5 for CD-4. The rest is a Panasonic RS-845US for 8 tracks, a JVC KD-65 for cassettes, and a PC for digital audio. Switching is done by some component video selectors for quad sources and a DJ mixer for stereo sources.
The music I listen is fairly diverse. One day I might be listening to classical and the next day it might be metal. I would say overall most of what I listen to is 70s-90s rock. During the past month I've been playing the Allman Brothers at Fillmore East a lot as I recently got both the quadradisc and the blu-ray set and currently as I write this I am listening to the Doobie Brothers Quadio.