My only suggestion is to be sure to use a LED driver that can be dimmed. I don't know a good way to design such a light to get exactly what you want, so the best idea is to design for more light than you want, with the ability to dim it down to get what you really want.
I think I would use 40 degree optics, then you could get that much PAR with less than 700 mA LED current, so the heatsink will not be at all critical. Here is what the calculator shows for that:
The problem with the 60 degree optics is that you would need over 1.5 amps of LED current for that PAR. That means the heatsink would need to be very good to avoid overheating the LEDs and shortening their life.