All the Sonic Frontiers have this feature and are available at good discounts from dealers on this site. Others are Audio Research Ref. 2 and LS25, both of the VAC units, VTL, and the new Bell Canto among others
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If you want the "Best" bypass there is only one choice, the VAC Standard preamp. When you switch it over to "Cinema" you completely bypass the preamp and the signal flows directly to the amp. The switching is so complete that you don't have to even have the preamp turned on!! I know this works because I have the VAC Standard preamp myself. That will save you tube life. It also has remote volume and mute.
my favorite preamp was the BAT VK5i until I tried the VAC. The VAC is a cross between the CJ Premeir Line & the BAT VKSE series. It has 95% of the midrange harmonics of the CJ and 95% of the transparency of the BATS, the bass is equal to the BAT (Low & tight). It also has a separate power supply which probably helps give it such low end control.
The BAT VK-3i has what they refer to as a "Unity Gain" circuit, which sets the volume at 0db gain, thus passing the signal thru at line level. I've been using mine for a little over a month, and although it seems a shame to burn the tubes for home theater use, is worthwhile for having the joys associated with a very musical preamp. Just my $0.02.