Zon Sonus. And you could have it special ordered with 35" scale. I've had two Zon's but only one detuned. Standard tuning for us was C# F# B E. If you cant afford that another option would to get a cheap J-bass and have a Modulus neck put on. The Modulus J-neck sells for around $560 from a retailer. I know because I ordered one 4 weeks ago. Hope that helps.
+1 The best answer. Any 35" scale will do, but I wouldn't use a Jbass for those kind of lows, and a Dingwall or Quake bass are out of your price bracket.
A good friend of mine used to tune to A# and it was on a G&L ASAT 4 string. He gigged regularly with it and sounded great. He had no complaints about the way it handled.
Checkout the Warwick Vaympre Rock bass. $900, same electronics and hardware as it's German big brother at 1/4 the cost! Plus they come tuned in like F or F# http://www.zzounds.com/productreview--WRWVAMP4 Pretty neat bass for $900.
I've played many downtuned 34" basses with a solid low A. It has a lot to do with your strings and how much tension they have. PERSONALLY, I prefer 34" scale since I've had more options when it comes to strings as opposed to 35" scale which was more restrictive IME.
That's where I'd start. A detuned light-gauge B is going to flop (albeit slightly less on a 35" than a 34"). Check out Circle K's tension chart to get an idea what sort of tension different gauges would give you when tuned to A.
Any bass with big enough strings. I every now and again have occasion to tune down to B or A, and I'll generally use one of my Carvin 4's strung up with the heavier four strings from a standard five-string set (toss the lightest string). Sounds great.
Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products. Browser not compatible