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It's 4Mal's gig now, and yes, he does the Barker Bass thing. To good effect with that band. I'm surprised I didn't think of that example. That was the band that had me looking into DB.
I still play in the Blues style, and while a DB would work for the style, my present band is LOUD, not a great setting for DB. P bass tone is the ticket for the current gig.
When I think of an EUB, in the sense that EUBs are electric versions of a full scale DB, I think the BSX line, a bass that can be bowed as well as plucked or slapped.
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Not exactly the rockabilly look.
I'd be looking more toward the King doublebasses for attitude and authentic DB for slapping.
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The Barker basses are super cool. The Barker basses use a regular scale fretted neck, or fretless if that's your flavor of choice. These are something new in the market.
Barker Vertical Bass - incredible tone from an easy to play upright electric bass
The Barker basses style can pull off a blues rockabilly thing, IMHO, and Mal gets good use out of his. I've played a few models at local TB GTG's. Lee Barker is a very nice guy, TB member, and well worth checking out for more info. If you are tired of that strap weighing your shoulder down for hours at a time, the Barkers are a cool idea.
The BSX style of EUB is more often found in a Jazz setting, though Passingwind can take it into uncharted waters with massive effects and attitude. Nothing like bowed bass into full overdrive.
The OP isn't going to get into either for his budget. The new Chinese DB's on offer at local stores were almost unplayable. I gave it an "almost" because I could play most of three strings. When I did find decent playing DB's the price was in well into the thousands, and things started getting really sweet around 10 grand. There was a huge range of possibilities, but they all involved some serious coin.
I backed off because I didn't need another project, and my take was that the DB was going to take a good bit of getting used to before I'd be ready to play it out, and the gear is another factor. Pickups and amps to get a DB sounding right without feedback, well just take a gander at the DB side of Talkbass. Even the Kay I borrowed was old enough and beat enough to be in need of several hundred dollars of repair just in getting the fingerboard back to unrutted. The old girl was fifty if she was a day, and had seen hundreds of school kid's worth of abuse.
I certainly didn't mean to discourage anyone! If the right deal popped up, I'd jump in again and have another go.
I only wanted to share my experience to date with DB.