I used to have a DHA VT2, and I've not encountered anything since that can add the same great sounding shimmering harmonics over my sound. The VT1-EQ-Drive looks great, I'd go for it if the bulk of it and the heavy power supply aren't an issue for you. I want to pick up another one some day.
For me though, I wanted something smaller and 9v powered (I know the DHA can work at 9v but really sounds best at 12v) and settled on the new Sansamp VT Bass, which I much prefer over the older BDDI. People are going nuts over this pedal, there's a huge thread over at Talkbass where people are wetting themselves and talking about it like it's the messiah. It's not the messiah, it's a very naughty pedal.