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Have you considered something along the lines of a Steinberger shape? Hohner B25's are very nice and light (and very affordable too). They do require some modifications to compensate for the weird ergonomics: the Streamline is somewhat of a singlecut design, with normal strap button positions, but the Hohner has the front strap button behind the 21st fret! So on a strap, the first few frets are awkwardly far away. I have a 4-string B2A and it's a lovely bass to play and sounds great in active mode (but very bland and dry in passive).