....I'm basing what I said on what reviewers have said, not what is on Corsair's website. I mean if you have seen a bad review, or have had personal experience with them, I would love to hear more so I can see what they did not like about them (As I said, I am considering them myself). However if you are simply putting them out of the equation just because you feel like they are "gaming grade" and therefore obviously can't be of good quality, than that is just as bad as someone calling them amazing based on what they see on Corsair's website.
Near-field studio monitors have their place for flat response, and accuracy. They do, however, lack bass, and I mean the bass you feel, not just hear. Games, movies, and some music are simply lacking without this. I recommended the SP2500 because on his original post he stated he wanted a 2.1 system, and his original idea was 2 tower speakers (which put out plenty of bass in their own right) WITH a subwoofer. He even stated he listens to Dubstep and Hip-hop, which are all very bass heavy, which would mean he would be very disappointed with just studio monitors. That, and the SP2500 seems to be the highest rated 2.1 system available in that price range.
OP, as someone who also loves to blast dubstep/EDM music, unless you want to REALLY rattle the walls, a good set of tower speakers will put out plenty of bass! This is actually what I did, with the Infinity Primus P363 speakers. They rate about the same as the Pioneers you originally mentioned, and honestly you can't go wrong with either one. If possible, listen to them side by side to see which you like better, but again, if that is the route you want to go, both the Infinity and Pioneers are amazing when they go on sale for ~$100/piece. The fun part about towers is that they are usually tall enough to where they are positioned perfectly as far as height, and when you face them in toward you, sitting in the middle, the sound actually feels like it is coming from behind the monitor. It is a strange effect knowing the sound is coming from 3 feet out from the side, but I swear it works amazingly well. This is actually what I did, and couldn't of been happier just running 2 tower speakers on my PC. Again, you may be surprised with how much bass towers can put out, and may not even find a need for a sub. This is where the amp comes into play:
If the towers are positioned less than 3'-4' away from you, anything beyond 30watts/channel is just overkill. I ran mine for a while off a FiiO E9, which is only rated for 14watts/channel, and believe me, it was LOUD! I ended up switching to a Marantz 2325 receiver that my dad is letting me barrow because it does have a cleaner bass response and warmer sound, which works great with the very bright Infinity's. I think the highest I turn it to is 1/4-1/3 volume though. The Lenpai LP-2020A is a good recommendation for something to start out with for you if you decide to go towers. Hooking a sub up to is properly may be the biggest trouble if you should ever decide to go that route, though the Monoprice sub may make that job easier with its high-level inputs. For this, having a good preamp-out/line-out or a dedicated sub plugin is going to be the way to go, though this is going to usually require a receiver/integrated amp of some kind. A decent one can be had for just a few hundred dollars on the used market, but at this point when you also factor in the cost of the sub, you are going to be way over your budget.
Or if mixing, matching, and always trying new audio gear doesn't sound fun to you, then do something like the Corsair SP2500, and I'm pretty sure you will be very happy; Also look into a new sound-card down the road no matter what you decide on.