However: If you think the market in Miami is crazy, in NY it is NUTS. People are showing up at open houses sight unseen with cash offers in-hand. The prices are getting bid up like crazy and the demand is so high. Truth, he might be better to rent for a while - but the rental market there is even crazier than the sale market. There are a lot of independent firms that demand that you sign a contract requiring the tenant to pay a commission (sometimes 3 months) with no regard for the fact that the agent might also be collecting from the building he is showing you. You can peruse the NY rentals on-line, too, and go direct to the buildings. Cheaper and often easier.
The agent we work with up there is Hadas Benoir, with Douglas Eliman; she's been quite good at finding sales and rentals. I expect you could find her on-line.
If you only want to browse listings, realtor.com should be sufficient. You can also join NY MLS board which is $29.99/month or $300/year. More information and general requirements are under the link below: