About a year ago I emailed Nino specs on a 5-string bass with every option I'd ever wanted. He promptly returned my email with a price quote, which was
extremely reasonable. His waiting period at that time wasn't bad either. I've never played one of his basses, but I've looked at the pictures on his site many, many times. IMO Nino builds fantastic basses with superb attention to detail at the best prices to be found anywhere. With Nino, you aren't limited to a certain brand of preamp or pickups. I really like that. Plus, he's a great guy.
I was ready to pull the trigger on the Valenti when I found a Mike Lull M5V on the Blueberry Hill Bass site. I'd done business with Jay Lewis (JPJ) a few times before, and he's become a long distance friend.

The Lull had the pickups and preamp that I wanted, so I went with the Lull instead. It's been almost a year, I'm still amazed by it's sound and construction quality. There's not a single thing about my Lull that I would change.
The only downside to both Mike's and Nino's basses that I see is that they don't have as good as resale prices as many of the other upper-end Fender-style basses out there. But IMO if you get every option you want on an instrument, the chances are very slim that you'll ever sell it.
And if you find a used one, either brand of bass can be found at killer prices. IMO you can't go wrong with either a Valenti or a Lull.