Man I pulled a budget build setup off Craigslist after coming across a great deal on some monitors. That stuff is actually cheap and if you take time and do some research you may find some good deals. I snagged a pretty awesome Yamaha RX-A720 Aventage and it's pretty gnarly. In perfect shape for $80! Using some Polk Monitor 40s and a Polk 10in powered sub. It sounds nice. Connected with Toslink. The receiver is network enabled, so I hid it and use the app to control it. Turns it on and everything over ethernet.
I use rockit 5's , they're just a beast all around , but i do alot of audio recording so that's why, 300 for a pair add a decent sub box and u can host house parties with these mfs
The Blackweb keyboard/mouse I had were pretty bad, but honestly, the cheap Blackweb speakers from Walmart are actually pretty darn good for the price you pay.
you will be very pleased and anyone next to you will be pissed I had 2 sets of these I took my extra one into work when I worked in a very loud factory and I could still hear it through my hearing protection and over the machines
Audioengine A5+ would look(& sound) pretty dope with your setup. I'm running Logitech Z506? 5.1 currently which are ok in the $100 range, but the A5 are phenomenal.