You have to try several as they're very system/component dependent. That said, I've tried the Blue Jeans and never found it optimal in various RCA-RCA coax scenarios. I've also tried the SilverStar (and many other brands) and found it not quite as good as the older Stereovox offerings.
I'd recommend these: Wireworld Starlight, VH Audio Spectrum (with WBTs), Townshend DCT (hard to get outside the UK), a-rt U-byte.
I'd recommend these: Wireworld Starlight, VH Audio Spectrum (with WBTs), Townshend DCT (hard to get outside the UK), a-rt U-byte.