I started with HC 110 Dil B. but have since moved onto D76 1+1 and Xtol 1+1 plus Rodinal 1+100 for stand developing Tri-x pushed to 3200 ISO.

Of D76 and Xtol, I like them both a lot. I tend to use Xtol 1+1 in the winter months with Tri-x at 400 ISO and during the Summer I go 76 1+1 and rate Tri-x down as low as 250 ISO. Xtol is easier to mix up though at room temperature.