I was going to buy a SB900 Flash but after thinking about it I decided to buy a alien Bee B800 strobe. At 285 bucks for it was a no brainer. I plan to buy a car power converter or a one of these http://www.alienbees.com/VIIsystem.html
so I am still at the same price of the Nikon SB900 flash. next will be a soft box.
The one thing I like about the Alien Bee it has a built in mount for umbrellas. I took it outside to see if my pop up flash would et it off and sure enough it does. I haven't tested the distance that the pop up will set it off. yes it comes with a sync cord but I know from past experiences that those cords come out easily , so I have to save up for pocket wizards soon