Nikon SB-600 Flash
I ordered mine from Amazon but I would also trust the good guys over at Adorama.
This is the middle flash model of Nikon's latest trio of flash models. Unlike Goldie Locks and the Three Bears this middle-option is likely going to be just right for most of you out there.
Power source: Four AA batteries.
Bounce Flash: Yes
AF-Assist Lights: Red and a lot less annoying than the on-camera white assist light.
Works on a film camera: Yes.
Controls: Yes, this flash has buttons and an illuminated display.
Wireless Control: Nikon CLS (Creative Lighting System) that uses IR only. No port for wired or other wireless trigger.
Recycle Time: 3.5 Seconds.
Front and Rear views of the Nikon SB-600 Flash
This flash has served me well for quite some time in all sorts of situations.
I quickly added to it some diffusers to soften the light a little bit and it has made a big difference.
This flash is my recommendation for a Nikon hot-shoe-enabled flash.
The SB-400 is a terrible flash and should be ignored by everyone and the expensive SB-800 is for professionals who will use it on a nearly daily basis and need the slight improvements over the SB-600.