Some good options have been mentioned here. One thing to keep in mind about Cannondale is that they use a unique bottom bracket specification that can somewhat limit your choices in terms of what BB you can use. Unfortunately, they are almost unequivocally the kings of aluminum. The allez sprint and even the Emonda ALR to a lesser extent are known to be somewhat rough riding. This is more of a concern if you are quite light.
Have you given a solid thought to whether you want disc or rim brakes? The upgrade from rim to disc will cost around $300 usually, which is not insignificant. I would say that if you plan on keeping this bike for a while, then go for disc. If this is a stepping stone to a high performance carbon bike later on, the weight/complexity/cost savings with rim brakes might be worth it.
Also, regardless of which bike you buy, I recommend leaving room for two vanity upgrades (ie, besides saddle, lights, computer etc). 1) a one piece bottom bracket if your bike has pressfit and 2) high end tires. Those two upgrades will make a big difference to the feel of your bike, and you can replace the OEM ones after they wear out so it’s not a completely unnecessary expense.
Last edited by smashndash; 08-29-19 at 12:43 AM.