The big shoot out will be the shadow and the pico slim.
Just as a passing comment, i have been listening to the T3 as well lately, and in the right set up and in the right application, the T3 matches the performance of much heavier weight opposition- caffeine ultra, P3+ and even the SR-71- each has it's shining moments with the right hardware/music, but the T3 hold's it's head up high- especially when paired with the sansa clip and modified im716's. This is all dependent on track selection of course, but generally, for just in the pocket- the T3 rocks.
I am very curious to see how the shadow and the pico slim will perform in a truly portable environment with pocketable sources.