Captain Obvious to the rescue.

Since you only want to drop a grand on this project, I'd start with a used Al frame of some sort or a new Leader. Stay away from stupid fixie garbage like deep v's and steel stems. Used tubular wheelsets often go for cheaper than used clincher sets, and they'll be lighter and ride nicer. Go threadless, and if you could find a more modern crankset with outboard bearings you could save a little bit of weight that way.

Mainly focus on wheels and frame though, since that's where most of your weight is going to come from.