Hi Agear, one of my best audiophile friends thought he was set if not for life, at least for a very long time with the TRL reference preamp, I believe it was the latest generation, until he auditioned the Concert Fidelity in his system, and sold off the TRL piece as fast as he could.
This only proves that their is no "BEST" of anything in our crazy/fun hobby. It comes down to personal taste and system synergy.