Ideal Gaming and Music Speakers for computer

I have a pretty nice gaming computer I play mostly fps games and listen to Punk/ska/alternative/classic rock.

I am looking to set up a descent full range 2.1 setup going down close to 35 hz (you crazy audiophiles can have your stuff below human hearing range). I do not like the sound quality coming from PC Speakers as I think even the high end logitechs sound tiny and cheap (because they are). I was thinking of cobbling together a bunch of used stuff to make a proper system. The following is my plan.

Denon AVR 589 (used $50)
2 X Energy CB-20 (used $200)
Pinnacle Model SUBcompact 8 (new $250)

I would probably prefer a more compact setup and the sub is overkill since I'll be 3 ft from it but most descent subs that go down to 35 hz tend to have more wattage. I am open to what you guys can do with $500 or if you think a soundbar and sub combo or high end pc speaker is the way to go for less money let me know (I am ok with less wattage). My current HT setup consists of two Mirage omni 350 towers, Pinnacle BD 300 center, and the rest filled in with energy take classic bundle and I consider this descent sound (although some of you may look down upon it). I would prefer to use a digital signal (I have hdmi/tos link, and rca spdif) out of the computer as integrated realtek sound is not the greatest. My computer is in a terrible spot to run wire to the rear for a true surround sound although wireless might be an option. Thank you to whoever helps and hopefully I provided enough info about what I want.
Edited by boykillsworld - 1/21/13 at 6:12pm

I bought my parents the same sub for their HT set up. It is not a very tight sub. My Energy ESW-8 that came with my take 5 classic set sounds much better even after I got the crossover to 80 hz with the polk with better front speakers although that one does make me giggle when you crank it up for an action movie or when my dad is watching Nascar. The amount of power out of that sub for the money is awesome and the fidelity is not too bad considering the price. Keep in mind again this has to fit underneath a computer desk and I will be 3 ft away from it.

Thank you for your input. I bought the Pioneer sub right away and I'm probably going to cheap out and stick with the energy CB-20s. I was able to pick up a used DRA-685 Denon stereo receiver with really nice specs for sound quality but I will have to get a sound card for the stereo out. I was thinking of a Asus Xonar DX as I like running linux. I'm still waiting on speaker wire and cables to set it up. I'm not real good at giving feedback on how something sounds but I will let you guys know if I'm happy with it. I've always been a believer in looking at a speaker response curve to compare and listen to it yourself to decide. No two peoples ears are the same.