Why a trip to SV specifically? Among the many reasons, there was the hope that, in SV, we would find early adopters for our technology product more easily. It took us a dozen meetings to finally realize that this wasn't true, and we didn't find people to be particularly more tech-savvy in SV — at least in comparison to Paris, London and Dublin which are the European cities I know the most.
I totally disagree with this. Having lived in London myself and now moving to the bay area, it's not that whether people are tech-savvy, but rather willing to spend time on something that may fail. This is what makes the SV gold. I found that culturally (specifically in London) that Brits wait until high tech get's proven in US markets and then they are willing to adopt it themselves. People "can't be bothered" to waste their time on technology that's not proven. Obviously YMMV, but this was my experience after working and building businesses there for 3 years.
That being said, you've already proven that people do want this product/service in large markets. All you really need to break into the US market is someone with industry knowledge and voila, you will have sales.
Note - I do find places like Stockholm and Berlin are also great places where early tech evangelists can be found in Europe.