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If you're going to have a dedicated SSCX, does going for something a bit more roadie not make sense for a new bike?
Track bike for summer, SSCX for occasional canal-path jaunts (or are you planning on racing?) then road bike with mudguards for fast/long and winter (imagine it's quite easy to pop your rack on/off)...
Decent group sets on functional commuters usually ends up being quite expensive too... although I suppose it depends how bothered you are about the weight...
Can you live with the inevitable spacer stack though...