Apples Oranges... The Z5 is Parlee's stock frame and comes in different heights through the size run. It's less than half the cost of some of their custom options.
Sarto are fairly economical for custom. You would have to find a dealer, but they're pretty reasonably priced and the quality is very good. I just landed this...
And it's been fantastic... (yes, I have used it while not plugged in to a trainer )
You won't believe this. I have been e-mailing the Sarto guys last week as I wanted to know how much their custom frame sets would cost. Unfortunately I got no reaction, so did not consider this as an option, which would get me anywhere. Well, browsing the internet today, appears there to be a LBS less than 10 miles from my place which is a distributor for Sarto in the Netherlands
I visited them today and was quite impressed by the bikes in their showroom and the possibilities, like both mechanical/electronic group set compatibility and option to have an ISP (not on all bikes though). Prices were reasonable too. Around Euro 2.600 - Euro 3.000 for a frame set of my choice. Sarto's top model, the Asola (used to be named the Cima Coppi, but exactly the same frame) was elected as test winner by German Tour-Magazin.de; the Asola was around Euro 3,500, which is beyond my budget.
@CharlesM: which model do you have? I guess either the Dinamica or Asola?