So here's some advice,

I own two Cannondale bikes: a CAAD 9 and a Capo. These two bikes aren't even remotely the same in ride feel, so suggesting one Cannondale road frame rides just like any other is a flat out lie. The CAAD 9 has a "springier" rear triangle and uses better aluminum than the Capo, which means its more compliant over longer distances. You can use the CAAD 9 as an all-round bike, but keep in mind you will run up against limits like no clearance for fenders and restriction to 700x25 or narrower tires.

Carbon will not blow up on you; its the strongest material currently used for bike construction. If you desire a CF frame, by all means test them out and see which one you like best. Also, don't be deterred by country of origin; Taiwan has been ahead of the US in CF bike manufacturing for quite a while now.

In any case, $2000 can buy a lot of bike, but remember that you will need at least an additional $500 for extras like shoes, pedals, clothing, and a helmet. With a lowered budget of $1500, a CAAD9 with 105 is certainly a very good value.