Do I need a flash? If so, what are some recommendations?

[virtuamike]

It's probably the optical slave and hotshoe adapter that are finicky rather than the SB-600. I'm using generic hotshoe adapters from Calumet to go to my PWs. If you're looking for name brand, try Wein.

 

[Jinny]

i have the 430ex, yes it does swivel and tilt.

Actually I just bought it recently and haven't used it much at all.
here is a pic i took at a car show over the weekend at iso800 f2.8
no post processing

http://farm3.static.flickr.com/2715/4145730617_a5de69aa1d_b.jpg

 

[twistedlogic]

It's probably the optical slave and hotshoe adapter that are finicky rather than the SB-600.

Posted on another forum:

"SB-600 for example has a low 3.3V sync voltage, and optical slave performance is reported to often be an issue." "...people reporting success are virtually non-existent."

Looks like I'm sticking with PC cable or radio.

 

[DaWhim]

I shoot with D40 + 35mm + sb400. I like to carry light, not carry too much junks with me. I could go with sb600, the thing is I wouldn't normally be carrying it all the time and will probably miss the opportunity to use it. I always bring the sb400 with me, the light is nothing and the size is so small.

I will be getting the sb600 this year. best to have both.