Jamie. Currently going through something similar. Looking for a valve based DI box, preferably with two balanced outputs, preferably with EQ, preferable with compressor, preferably runs from IEC power.
Lots of options, but difficult to find exactly what you want. I tried the Summit TD-100 and Summit TLA-50 at Bass Direct at the weekend and was well impressed - the main issue with that is that they're around £400 each, and wouldn't have an EQ sectino unless I forked out another £550.