My jury is still out on Serotta. Clearly beautiful, high end frames and bikes. I had a Colorado TG that was a very pleasant ride, but didn't move me. In part, that was because the ST and HT angles were more slack than I like.
My advice, set it up and ride it long and hard before you decide to replace the fork. The carbon fork will same you 1-1 1/2 lbs. And, frankly, I like the ride qualities of carbon forks.
My Murray-Serotta 7-Eleven replica is my favorite riding bike. Easy to steer from the hips - rides nicely no-hands, but still corners nice and sharp. It's definitely not slack - the toe-clip overlap is evidence of that. My brother has one a bit older that is one of his favorite riders, too. Of course, different eras and different owners and preferences change the equation, but mine definitely doesn't have a slack head HT angle, that's for sure.