so for a pure CX racing bike, if you have only so much to spend, do you get a 'higher end' aluminum frame and spend the $$$ on a nice carbon wheelset, or do you take the $$$ and get a great carbon frame with a nice aluminum wheelset?
so in other words, do you go for a (for example):
CAADX w/Ultegra (alloy frame, ultegra groupset, for a shade over $2k) and then add a $2k set of carbon wheels
or do you go for a (again, just an example):
SuperX Ultegra (carbon frame, ultegra groupset, for just under $3800 total)
don't so much focus on the bikes themselves (not a question about Cannondale nor those specific models, they are ONLY EXAMPLES), but a focus on which is the more economical and better use of cash if the Minster of Finance grants you a $4k budget.
You're going balls-out for an hour in CX and you want to go as fast as possible. Yeah, the carbon frame probably doesn't beat you up as much, but everywhere I read, I always see that the best bicycle upgrade is a great set of wheels. I'm less worried about comfort (I have a Fargo if I want to "enjoy" my long mixed-surface ride!) and more worried about speed.
also, don't be afraid to provide your reasoning.
(again, PLEASE don't worry about the bikes themselves, they are purely for example purposes to highlight my question)