Best bet is Shimano 105, first generation, 1050 series. Excellent brakes, widely available, will work with any brake lever from that era. Polished, too. Next best would be Tektro R536, dual pivot, more pricey (around $55), but also widely available and a great set of stoppers. Cannondale also sold a series of house branded brakes that are out there on eBay from Wheel and Sprocket, they go for around $30 a pair. You can also use second ten 105 (1055 series) but they aren't polished and won't look as correct.
__________________
Hard at work in the Secret Underground Laboratory...