I challenge you to identify the difference between $10 RCAs and $200 RCAs by ear. Even with the cheapest of the cheap RCAs you would not get a significant loss of signal. You would be hard pressed to be able to measure the difference with the most expensive test equipment. You're looking at distortion in the 0.0001% range. Excellent amps have distortion figures several orders of magnitude higher, and it's still inaudible.
With a small home system (low voltage line level signals) RCAs are of marginal concern, despite what the cable manufaturers would have you believe.