The annual AIPAD Photography show brings together a staggering variety of photography, from modern to vintage and everything in between. With nearly 100 of the world's leading photography galleries presenting their best work, it's a photo lover's paradise. But for a collector, AIPAD is an opportunity to find some serious deals and to make some major investments. As photography continues its climb on the contemporary art market, savvy collectors are scooping up work by emerging artists and rediscovered masters at an intrepid pace, and often with big rewards on the secondary market. Here, American Photo picks a few of the best investments on the floor at AIPAD this year.