Best MC step up transformer


I am trying to find the MC transformer for my system. Now I am using Koetsu Urushi + Audio Research Phono Ref 1 with Jensen inside. The sound is pretty good but as always I wanna make it better. I've tryed to use old Koetsu MC step up trans but was unhappy about it. The sound was dull, not clear. When I've looked through ebay and audiogon, I've recognized that they are a lot of unknown for me variants (from 6k$ kondo to 100-200 $). Could you advise the best variant from quality/price point of view ?
shmelev_dm
When using the Koetsu MC step-up which ARC inputs (low or high) did you plug into?
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I personally use a Hiraga pre pre borrowed by a skilled audiophile,but you may found something interesting on Salvatore site.
http://www.high-endaudio.com/RC-Step-ups.html.
I know one man quite satisfied with the concordant one on a high end system.
I'm using a pair of silver Lundahl 1931AGs fronting a Sonus Veritas beta Venice. Transparency is not an issue. Neither are dynamics (micro and macro), transient response, harmonic development or musical flow. Bad news, not cheap.