My husband rides a Giant OCR as do I. LOVELOVELOVE it. I have the 2006 OCR Limited.
But DH is so intrigued by the Orbea's. And he's like a dog with a fresh bone and won't let it go. But what I have learned from his experience and research of the Orbea is this:
Ride more than one version of Orbea. Some have their new design of gears, SRAM. Big difference from Shimano and my husband HATES them. So he is looking at test riding an Orbea with the Dura Ace gears. Of course, Campy is an option but I feel safe in saying SRAM is out. As well, we hear that Orbea's are really "twitchy and tempermental" but we get that from people who don't ride one. One LBS owner we spoke with DOES ride an Orbea and he claims it handles better than his Specialized........ who knows?? Personal preference I guess.
I don't think there was a huge difference in geometry between the Giant TCR that he is also eye-balling but the 2007 Orbea Orca definately has him drooling..... he's kinda keeping tight lipped about it as I am FREAKING OUT over the price tag......