Hey, Larry--
The First Sound is an excellent preamp, no question. I had it in my system for nearly a year and enjoyed every minute of it. I could have lived happily with it, I believe, were it not that I wanted to get back into vinyl, wanted a pre with a phono stage, and stumbled upon this thread when it first appeared. In short, I did wind up ordering a Syrah and put in my six months of waiting like everyone else, so I have had the opportunity to compare and contrast these two preamps.
The First Sound definitely paints a blacker background and is less sensitive to tube noise, although the Supratek can get pretty quiet if you fiddle around long enough with isolation and, more importantly, getting good tubes. It takes a little time, but is well worth the effort. Still, advantage in this area goes to First Sound, which has the lowest noise floor I have heard in my system to date. It is almost eerie, especially for a tube preamp.
Also, the First Sound is incredibly dynamic. Matched with components that are up to the task, this preamp will rock your world. It has incredible impact on all kinds of music. If you lean toward solid state, but want some tube warmth in your system, the First Sound may be the ticket for you, as it has NONE of the "mushiness" frequently associated with tubes. It is clean and clear as a whistle, but without any grain or stridency.
The Supratek, on the other hand, is much more liquid and has a far better layering of instruments, WITHOUT sacrificing dynamics. By comparison, the First Sound seems almost compressed. I think this is the main reason so many people are in love with the Syrah. As has been said before, there is something about its presentation that just feels "right." With a lot of audio gear, even the First Sound, I am more aware of listening to the gear--this one does that better, that one does this better--than the music. That can be fun, but it's not really what it's all about for me. With the Supratek, you can let all of that go and just enjoy the music. I have found nothing in high end audio that I would consider as purely musical as the Supratek.
Some people may prefer the First Sound, and it is a terrific pre, but I much prefer the Syrah in my system. Believe me, it was worth the wait. With the best restaurants, it will be the meal you remember, and not the wait. The same thing applies here, I think.
Best of luck.