I think you really need to think thru the issue of using the G lenses in the first place. I haven't followed the development of the Nikon G lenses but the ones I've seen seems to be consumer grade lenses. I you are doing weddings and other pro jobs, you need to look into pro F2.8 lenses. The F2.8 lenses will focus faster especially in dim light. I am a long time N90s user but if I am looking for an upgrade I'd look at the F100. Of course, I'm kinda surprised that you're not looking at digital for weddings. That seems to be the direction most wedding pros are going.
Nikon is starting down the path of making pro level G lenses. I think that you would most likely want to look at the F5 or F100 in order to be able to take advantage of that trend. It's not a trend that I am happy with, but it is there so being able to use your current lenses and future pro offerings from Nikon to their fullest would seem like a good idea. BTW, KEH, an AUG sponsor, has F5 bodies starting at about $550 in bargain condition. Only about $100 more than an F100 in Bargain.
I wouldn't suggest going for the F5. Too many incompatibilities with older lenses (the F4 offers 99% compatibility).
However as pointed out the AF, being first generation, is too slow by todays standards (that however never stopped me from doing some sports photography) and you need to get used to it. If you use manual focus then the focus confirmation light (green light in the viewfinder) is a good tool to help you when in doubt about proper focus.
ones I've seen seems to be consumer grade lenses. Of course, I'm kinda surprised that you're not looking at digital for weddings. That seems to be the direction most wedding pros are going.
They are consumer grade. They are slower and are all plastic... They are still Nikon glass though and a lot lighter... And to answer the digital question, I have considered the possibility of digital while also shooting MF B&W... Kind of the best of both worlds.. But, I shoot with another photographer during weddings. She shoots all the color and I shoot B&W... So, until that partnership changes, I get to use my beloved film.. Also, I'm banking on picking up the niche market of people that still respect film and are interested in photographers and not "shooters".... Many people like the idea of a 11X14, fiber print, hand made and mounted by the photographer..
If I couldn't in the wedding market not using digital, I would probably just give up weddings in general... I like the extra cash but I am not trying to feed my family with it.......
The upgrade path in Nikon's system from an N80 is an F100 or an F5 or an F6. Anything less is going to present compatibility issues with your G lenses. I have an F100, and it's very nice, AF is good even in low light.