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
I use a Raphaelite PM 1.1. I bought it through Pacific valve, and although they no longer carry it they might be able to get you one. About $600, and phenomenal in performance. It will give you a deeper bass response than most solid state MC stages.
Any SUT delivered without a Data Sheet about it specs is wasted money (Most have no sheet or they are wrong), I would give any SUT to an external Lab for an independent check ... I saw so many where the Tech scratched his head and asked me "Paid more than $50,--??
For a more reasonable amount, how does the Lundahl LL1943 compare with the likes of the Audio Note, Fidelity Research or Auditorium 23 ?
I'm using a Tribute SUT, the current version (with a bigger core) to interface between TSD15 and EAR834. Fantastic performer...lot's of interesting emotional moments delivered.
I've checked it with a lab mesuring equipment: flat, no resonances anywhere=safe to use. The real drawback is the waitig time...

I'm thinking about a second cart-SUT. Has anyone tried Silvercore SUT's? Esp. mc25 in 100% silver against LL1941Ag?