Dream bike build

I am in the fortunate position of being (finally) able to afford a dream bike, so I thought I'd ask (or troll ) here for thoughts... [and yes, I am slightly inspired by the program with Rob Penn that was repeated on TV the other week.]

I ride 50 - 100km at the weekends and the odd sportive, I have an existing bike that will be the commuter, but I'd commute on the new bike too when the sun is out. So, the new bike just needs to be a bike to ride for fun, no need for guards, panniers etc, it won't be used for touring. Not interested in racing eithjer, more interested in a good "feel" and a bit of comfort. So, I'm looking for the bikes marketed as "classics" or "endurance" rather than "race". That said, I'm not interested in the marketing terms as such, just how the bike rides and how I'd feel after 3 or 4 hours.

I'm currently thinking of Colnago CX Zero + Campag Chorus. It's not exactly a budget option as the UK distributers don't sell Colnago with Campag, so I'll be ordering frame and group set separately. I'm not sure about the wheels, obviously something light would be good but given the shoddy roads where I live that might be false economy. Is there a good compromise between light and tough? I'd run 25mm tyres on it, any less is just too much like hard work on my roads (maybe I'd switch to thinner for a trip to the alps), the fella in the shop reckons Mavic Ksyrium SLS C would be a good match for "that kind of bike" (his words). Last time I bought a bike it cost less than those wheels, so I'm slightly in new territory here. I don't think the shop is trying to rip me off, but I don't have enough knowledge to know for sure.

Any thoughts? Should I look at other options for any/all of these option?