Thanks, guys.
Apparently it's in Spain already. They're moving super fast with this one. (I still don't think it will be here before Monday, though - it's in the hands of Correos now, and they're not known for speed, although they did manage to deliver my bike successfully.)
Apart from the price thing, and getting Rebas on it, the mostly Shimano groupset was a contributing factor for me. It's all stuff I'm familiar with, and since I'll be the one maintaining it, it would be silly to make my life difficult. (We do share jobs in this house, by the way. My OH says, "Help, my gears are crunching," and I say, "How do I turn on the hob?" Since I'm a lousy cook and she's a rather good one, I think it's an excellent arrangement.)