If a 54 Secteur is only 16.5, then a 17 is going to be a very difficult find, because Specialized is about as tall as they come. You may want to compromise your shop's recommendation, though, especially if your arms are more proportionate to your legs and you have decent flexibility. If this is the case, I wouldn't hesitate to try any moderate design such as Trek H2, Scott CR1/Speedster, Specialized Allez, etc.
If your legs are extremely long, such a 50% or more of your total height, and/or the arms are short and/or the flexibility is a problem, your best find might be a Secteur or a Felt Z-series.