I need help upgrading my system


My current system is in the mid to low quality range. ATM I mainly use it for listening to music (primarily metal and rock; I'm young, I know) and A little for gameing, But i mostly use my headphones for that. Heres what I currently have:

Insignia Is-HC040917
-totaly pos
-designed for surround sound
-says "500 wats" (I doubt it)
BBE 362 Sonic Maximizer
-bbe process and bass contour turned all the way up
1 Realistic Optimus T-110
-original 6" woofer exchanged with 8" woofer
-have annother, not using it
-used as "center" channel
2 Fisher DS-825 l/r
2 Yamaha NS-A636

I got the speakers for free and the reciever for cheep, so for a grand total of $65, its not too bad. However, I think its time to upgrade. Also remember that all of the sound is comming from my computer, and all songs are encoded in either aac or apple lossless. That being said, I want a new reviever/amp, and 2 new speakers to replace everything. What I need to know is what should I keep, ditch, upgrade, etc. However, I am also how on cash, so I need really cheep, but really good sounding with Slipknot coming out of my good sound card encoded in acc. What can I do?

thanks in advance!

~max
elmo541992
Sorry forgot to mention that you would have to connect your PC output to an input on your new receiver in order to play your music files. I'm not sure how this is done but perhaps someone else on the forum can explain this.
PDN, I was mostly looking at stereo, abd I was thinking if buying a pair of used "stage-quality" klipch la scala's. Would these be over kill? Also, if I get something like a used denon, should I continue to use to sonic max?
don't worry about how to connect my commpute, that's the part i've got covered! thanks for the help btw.
Sorry but I'm just not familiar with the Klipsch sound nor could I find any data on the La Scala's at the Klipsch website. I would say that large floor standers for a room 10' x 10' x 8' high could be overpowering. I good pair of bookshelf speakers such as the B&W 685's, older DM601 S3's or DM602 S3's with an NAD or Marantz for example 2 channel integrated amp or receiver will (IMO) blow you away. Does your room have carpeting? A used Denon 2 channel receiver could be a good choice too. I wouldn't go any lower than say 50 watts RMS per channel. I hear great things about the Outlaw Retroreceiver at 100 watts/channel RMS. Check it out at their website. I came close to buying this but went multi-channel surround sound for both home theater and music.
Yes, my room does have carpeting. Also, will any of these speakers sound any better than others with metal and gaming from my pc? Also, say I went with the denon amp and the b&w speakers, should I continue to use the sonic maximizer?