Hi Ahleha,

The Sb600 and 800 are newer flashes that will work with Nikon's most recent incarnation of e-ttl (I always forget the acronym). You probably don't wnt the SB 24 or 28 (though they are decent flashes). The SB 800, which I have used many times, is a much better designed flash than the SB 28 was.

-JM