Best cables for Thiel 2.3

Cardas.

MIT for sure! MIT,Krell and Thiel will give you everything you are looking for. I own these brands a few steps up the ladder. (FPB 300, CS6, V3 & 350 series cables)

Harmonic Tech Truth links for the IC's and Cardas Cross for the speaker cables. Cardas cross or better all around if you can afford it but the HT Truth links are good for taming the high's at a reasonable price.

You may find it better to sell the Krell and get a Plinius integrated instead though. The krell (KAV line) sounds good at first with Thiel but grows to be too annoying real fast.

MIT would be my first choice, I'm using Kimber 8TC with 3.6's but with a Classe amp and CJ tubes in the pre, I think a little warmer than your setup. I'm also using MIT IC's. I'm waiting on some MIT speaker cable, my experience is MIT ic's and cables used together bring out the best in both. MIT has commented to me that Thiels are a good match with their wire.