I like the OBP-3, it's a nice musical preamp. I'm not in love with it though. I think if you can get a Pope Flexcore for a similar price you'd be better off with that, as it is incredibly neutral; when you set it flat you get your passive pickups 99% of the way they'd sound without a pre at all. That's really important if you sort of want a great pre but also really dig the current passive sound of your pups.
The Audere is a really nice pre as well, both the 3 band and the 4 band Z mode units. For the buck, it's probably the best around as you can get them new for under $200. East makes a superb pre at a higher price point...there are lots of good preamps out there I think my choice for a low/mid/high type pre would be East first (with the always on passive tone), then the Pope. That's because I'm biased towards 'always on active' though, they are both excellent units.
I'm going to be replacing the pre in my Carvin shortly with an ACG EQ-01 filter pre, which is a filter based pre and also pretty versatile. I'm going that way though to get my feet wet on filter pre's and didn't want a single LPF for both pickups but rather one per pickup.
How many holes are you trying to fill? Some of these pres need 4 or 5, though the Pope is (as its name suggests) pretty flexible as to what you can do with the available holes for pots. Almost all of these work fantastically with just the 9v as well - no real need for 18v here.
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