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Sorry my answer won't be helpful but instead is honest based on my knowledge and experience:
There is none ;(
See, for 500 bucks its not even possible to buy a set of drivers (even not including the parts for the XO networks or casing wood) to be "good" for a surround system.
You will have to make a decision of what's more important to you and here is what I would do:
Search for a set of 5 speakers which sound pleasant to you and buy them. I assume you have an amplifier? If not it makes it even harder...
I would add a subwoofer later, and then a descent one, depending on your living situation. Most neighbors hate subs. Especially bad ones as they shake the walls more than the air in your room.
For 500 I would - assuming you have no stereo system- build a stereo system having in mind that the additional 3 speakers are merely for effects. It's cool when it's set up perfectly, but I saw that rarely in this price area.
If you don't have the knowledge about a perfect setup ask a friend who really does. It makes that difference, even more for surround speakers.
What I can recommend are surround receivers with audyssey room correction and automatic measurement. This lifts the surround feeling on a proper level immediately. Add first 5 small suitable speakers you like and later a real sub. Don't buy a bunch of crap for 500 :)
It's not worth it and just makes the manufacturer happy ;)