any experience with TRL mod ?

There's a new TRL 595 review at the following link, which might answer a few of your questions.

http://6moons.com/audioreviews/trl/595.html

Thanks for the link, jes45. I've been waiting to see the review prior to making my decision. Maybe I should try the C2000ES instead?

Paul Wietzel of TRL told me that the modded 2000ES sounds better than the modded 595. Given that the 2000ES has a lot in common with the 595, its good that the extra $$ gives you better sound quality and not just better looks.