Depends on the sound you're going for, but to start you MUST have fresh rounds on your bass, otherwise you're just pissing in the wind if you're want to bring out that classic EBMM sound.
Here are a few amps that I've used with my EBMM basses and my thoughts on them:
1. GK700RBII - This was punch, crunch heaven! It had the snarliest tone of the lot, but it wasn't very supportive in the low end. Very mid-focused and only really applicable to punk, hard rock, and other super aggressive styles.
2. Ampeg SVT-CL - Probably the best sounding of the lot. The tone was warm and growly without being to over-the-top. It sat well in the mix and supported the entire band, but it didn't do slap stuff as well as I'd like.
3. Markbass LMIII - For the weight this head definitely wins out. That said, the tone was always clean and incapable of doing really aggressive tones. It was a more pleasant sounding amp.
4. Aguilar DB750 - This is my standard. It had all the goodness of the SVT, but it was also able to do modern tones much more easily, too. It was able to go cleaner and dirtier than the SVT as well. It's my number 1 choice, but it's very expensive and heavy.