The CAAD10 disc frame uses 700c wheels with standard hub spacings (135 mm rear, 100 mm front). The width of the rim you should choose depends on the size of tire you intend to run (which is limited by your frame). It looks like the bike was originally spec'd for 700x25 tires. Based on other Cannondales, I'd guess this is somewhat tight to begin with, but if you're lucky you might be able to run 700x28's. So, pick the rim width accordingly (likely 13-17 mm).
I'd suggest buying complete wheels (or getting a wheel made by a competent wheelbuilder, who should work with you on selecting appropriate rim+hubs+spokes for your needs). Note that you need disc brake hubs on a CAAD10 disc, and your rotors have to be compatible with the hub (or you have to use an adapter).
Often, you can't get the exact parts spec'd from OEM's (there are lines of parts specifically for OEMs). But its not hard to find equivalents or improvements for around the same price (even if you can get them).
Note that a decent number of wheels (especially cheaper ones) need some adjustment before they're ready for the road (even if they're brand new) -- you'll likely want to use a bike shop for this.