TD100: Wonderful little toolbox! Variable input impedance, polarity reverse, tube gain stage, direct out, mic level out, line level out, sounds GREAT.
$250 shipped CONUS. 
2BA-221: Hi-Z instrument input, line level input, and mic input; gain stages for the various inputs as well as a tube output gain stage; mic channel has phantom power, HPF, variable input impedance, and -20db pad.
Mic level output, line level output, and various stacking in/outs/inserts.
$400 shipped CONUS 
Buy both for $600 shipped and a rackmount adapter (shown) included!
