I'm a Jazz man, and have been through a fair few pres. Aguilar Tone Hammer, MXR M80, Hartle Baas attack, BB Xotic, and DHA VT1eq are the ones I can remember. They all has their plus points, but I went back to the DHA because of the eq. Moat of the 'bass Pre' pedals have a 2 band eq (bass and treble) with no ability to dial in more mids.
If you want 'punch' then you might want to consider a compressor though.