I'll second spade2you and smperry in saying that if you can pin down more details of what you want you'll get better advice.
I've played a lot of the basses mentioned in this thread (probably 2/3 or so) and the worst thing I can say about the vast majority of them is that they weren't necessarily for me.
Personally I only want instruments from Alan at ACG and Chris at Stambaugh designs but that's simply because they fit what I want and your requirements may be very different.
In fact, as much as I recommend Chris, I think he can be a risky choice if you are iffy about what you want because he really will build anything. On the other hand, if you KNOW what you want and can either spec out the bass or convey it to him and let him guide you, you'll get a great bass.
ACGs on the other hand are a different animal. Incredible woods, amazing craftsmanship and and a custom preamp that is flat out amazing and a departure from the norm.
If either of these guys fit what you want I can't recommend them highly enough.
Here's Alan's site:
www.acguitars.co.uk
And there's a link to a gallery of Chris' work in my signature.
He also happened to send me pictures of my upcoming fivers today too: