I've been using a Marsh P2000b for years and find it to be very transparent and revealing but at the same time refined so it doesn't go too far. Thought that might be a good match for your system and I think it's under $1500 new. Here's a review from TAS although it's on the single-ended model, which is the same except lacks balanced connections:
http://www.avguide.com/products/product-2228/
Soundstage and Stereo Times reviewed the balanced version, FYI.
Best of luck.