Bent Audio Tap if you can find one. If you are a DIY type you can get all the parts from John Chapman at Bent Audio and build one yourself or have someone else build it.
I think Dave Slagle at Intact Audio/Experience Music would build you a very nice balanced passive preamp. I've been using a passive based around his autoformers for several years, and highly recommend them.
I am a big fan of the transformer/autoformer variety of preamps. I currently own a Sonic Euphoria PLC which has bested a lot of active preamps up to ~6K in my system. The PLC also beat out a Bent Audio TAP to my ears.
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