TMax yields amazing shadow detail, and it is possibly the best in that regard.
Two other developers that yield almost as much shadow detail is Kodak Xtol and Ilford Ilfotec DD-X. Xtol is by far the most economical.
You may also wish to look into using Diafine with Tri-X 400, but you'll be limited to shooting at EI 1,000-1,600, which is its normal speed. No pushing available due to it being a two bath developer.
Ilford Microphen might be another option for you.
- Thomas