Ken Rockwell gives pretty good (and up-to-date) advice on cameras, and he generally recommends Nikons for DSLRs. Here are his current recommendations: http://www.kenrockwell.com/tech/recommended-cameras.htm#serious
I would consider 2 options going for full frame FX or remain in DX , if full frame there are 2 D800 around 3k usd and D600 around 2k usd ....or jus remain dx D7000 model at around 1.5k usd ,,,good luck
Stay away from Rockwell he is a joke. Use this site www.bythom.com. The guy knows Nikon and writes a lot of guides (the best available) about them. Not exactly the easiest to get around, but most Nikon people check it every day. Check out his reviews of the Nikon cameras. Best around. Or you check out the reviews and forums on www.dpreview.com. Amazon did buy the site a few months ago but it seems to still be very impartial in the reviews.
Pretty much everyone bashes Rockwell. It doesn't matter which camera people use, most think Rockwell's a joke. If you shoot Nikon, bythom.com is the place to go although he has some pretty harsh things to say about the company lately. Nothing that would matter to the casual photographer.
I find Amazon reviews one of the best sources of information. Especially the one star reviews if you weed out those that are just whining.
I bought a Nikon lens that I didn't like at all and returned. There were lots of five star reviews and a single one star review (and also a negative opinion from Rockwell on his site). It seemed apparent that the glowing reviews were coming from people with DX format cameras, not FX. The weakness of the lens was in the area around the corners and edges which DX users would of course not notice. But as most one star reviews go, the poster was lambasted for his negative, but honest, opinion.
I used to read good reviews from Steve's and dpreview, but don't know how they are now. As many are subsidized, most reviews must be read with a discerning attitude. I don't trust Vine reviews much for that reason.
Ken Rockwell is a source of information, and to me, as good as any in suggesting some worthwhile advice. But I did get a 200mm macro based on advice that it served double duty as a telephoto. I'm sorry I ever got that lens and much prefer my 60mm lens.
As for the question about replacing a D80, I don't think there's a bad Nikon digital in the dSLR line. If you have the money, you can drop it on a D4. If you don't, taking Rockwell's advice that cheaper FX bodies have the same guts is probably sound. I've tried almost every one since the D70. The one I grab most of the time is the D3s, which has the best low light performance I've found.
But as I suggested in a previous post, if I was looking I'd consider a D800, or a d600 for $1,000 less. Or if $2,000 is still too much, one of the late model DX cameras will not disappoint. Cameras with massive pixel counts are only of benefit to prosumers looking to create huge prints (or a cropped severely). If pictures are only getting looked at on a screen, my old 3 megapixel Coolpix still works fine.
Since all of your lenses are Nikon, I'd go with the best DX camera which would be the Nikon D7000. FX are still too new IMO and cost too much. I called Adorama and got a showroom Nikon D7000 for $699 and a Tokina 11-16mm for $519 with 2 year warranties on each (like $20 for the lens, $40 for the camera).