I used to shoot weddings back in the "olden" days. I've still got my Sunpack 611 with the big belt-mounted battery and a shoe-mounted sensor. But I get tired of lugging all that stuff around when I just want a few lighted pics at a family gathering like Christmas or birthday celebrations. I'm toying with the idea of a shoe-mounted flash. In reading about it, I've noticed overheating problems with the SB-900 are mentioned frequently. Has that problem been corrected yet? Is the SB-600 a pretty decent flash? A friend of mine just purchased a Sigma EF-610 DG Super and is really pleased with it..........mentioning he'd been interested in the SB-600, but the Sigma was so much more flash for the same price. I'm at a total loss. Any recommendations?