JPS Superconductor 2 vs. others

I've been looking for used JPS Superconductor 2 IC'S to go between a Manley integrated with NOS tubes and a Cary 306/200 cdp. The JPS don't come up often and they're quite stiff. Any suggestions for other IC's which will outperform my Audience AU24'S and will cost under $500.00 used for 1 meter. Speaker cable is JPS Superconductor +. Thank you in advance for your input.