I recently became interested in preamp/power amp combinations rather than standard bass amps. I'm looking for suggestions for a preamp as the market is huge and I'd like to narrow it down to a few options. I currently have a Genz Benz GBE750 on which I use the blended FET and tube pres and I usually have the eq set flat, sometimes with a little low mid boost. My budget is <$600. Looking for a fairly clean tone, with a little bit of tube warmth. I'm also not sure if I should be looking for bass-specific preamps or if a mic preamp would do the job. All of my basses are active and I do most of my eq'ing using my onboard preamp.