Okay we are getting into a grey area here.
some argue that the cheapest rca cables will work just as good as the highest priced ones, like kimber.
I have used kimber cables in my car for one season, and there was a difference, not a 400 dollar per cable difference, but a difference none the less.
If someone were to ask, which rca's should I get without breaking the bank, the hypers would NOT be it, they are probably the same as the cables you are using now.
The cheapest ones I would recommend would be stinger, and would be the helix series. Any cheaper and you are just purchasing really low end again. I use helix in my car now (the first year they came out, they are cheaper quality now, equal to the dream series) but good.
if you can stretch it, get the dream series, you will be happier, unless your power and rca connections are on the same side, then go with the bullet's instead, because the unshielded last 6 inches on the dream series can allow unwanted noise to get into the signal line from your power and ground.
Keep your power and signal runs on the opposite sides of the vehicle, use the shortest cable you can, and when you do have the rca's run over a power wire, do it at a 90 degree so there is less chance of noise entering the signal chain.
I ended up running three runs down the center of the car, and the power wires on the outside of the vehicle (dual 1/0) and have 0 noise. There are alot of other tricks to keep the quality of the signal clean, like line drivers help out more then people realize. by increasing the voltage of the rca signal to 8 volts, you increase the resistance to noise, which was the true purpose of the line drivers, not for increased SPL. And going with a balanced line out of whatever deck you get will help as well.
Hope this helped out some.