For strobes, I like these:
http://www.jtl-lighting.com/JTL-Mobi...-Lighting.html
No worries about power since you take it with you in the battery pack and they're alot cheaper than the bees. I've got a bunch of the JTLs and I work the hell out of them. Good stuff maynard.
That D50 is an entry level DSLR with no on camera flash sync, so you're gonna have to use an on camera flash with sync out. I'd recommend the SB-800
http://www.nikonusa.com/template.php...productNr=4801
For quick and light key and fill light situations, I just use two SB-800s. One on the camera and one mounted to a tripod mounted hot shoe. Then you just set the flashes as master and slave. Kick down the fill light a couple stops and blast away.
Works like a champ.