Go with the Zurich. I have a 2003 Zurich and love it. In 2003 the frame is all 853 vs. 853 and lesser tube mix on the BA. The 2004 appears to have the same frame for both but the Zurich has the Race Lite 110 Carbon fork and the Race Lite wheels vs. the Bontrager Select. Those two items plus Ultegra vs. 105 are worth the extra $. I had allways been a 105 advocate until I got the Ultegra and there IS a difference. Good hunting and riding.
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LeMond Zurich(2003), Winwood Carbon Post, Fizik Arione Saddle, Speed Play X-2 pedals, 3T More Carbon Bar & Giant Carbon Stem, FSA Super Light 53/39 Crank Set.