I'm not sure what you intend to use your camera gear for, but here's a few things worth considering.
Full frame camera gear is certainly nice, but the down side to it is a larger weight and size penalty. The difference doesn't seem like much at first, but when you are lugging the stuff around all day and trying to decide how many lenses go in the bag, these differences start to matter. I certainly love my Nikon DSLRs(all of them are crop sensors), but there's many times when I wish I had something smaller and lighter that provided more quality than a cell phone. This is why I love crop sensor cameras. It would be nice to have full frame, but the few occasions when I'd really want the bonus of a larger frame doesn't justify the penalty I'd have to pay for it. Ideally I'd have a full frame and a crop sensor as I have several full frame lenses, but I also have a medium format camera so it would be even harder to justify.
The next thing to think about is whether or not you have any lenses left over from your D70 that you might want to keep. If you do and they are crop sensor lenses, this might also weigh in your decision. The reason I always stick with Nikon is because my lenses always work on newer generation cameras and most of my investment is in lenses. I still have a 30+ year old lens that works great on modern bodies and I use it quite often and I'm kicking myself to this day for getting rid of some of the lenses I used to have. Camera bodies are something I change out much more frequently, but I look at lenses as a long term investment.
When someone wants to make a significant investment in gear that uses interchangeable lenses, my advice is this. Consider what you want to do with the camera first. Do you want to take vacation photos, nature photography, portraits, event photography, close up, or whatever. Make a list, prioritize what you want to do the most and then start looking at lenses that will fulfill that role or roles best regardless of manufacturer. How many people go wrong is they decide they want a certain lens, and then try to figure out what they are going to do with it after they get it. Many times they find the lens they got doesn't fill their roles very well and they buy more lenses that do. Most serious amateurs I think will be served best by at least 3 lenses which are a wide, normal, and mid range zoom. The latter is likely to be the most expensive and can be put off, especially if nature photography is low on your list. If you only buy one lens to start, go with a mid range zoom and get the best one you can afford in terms of price and weight as this is the lens which will probably live on your camera most of the time. Resist the urge to buy a "do everything" lens that covers super wide to long telephoto.
If you are looking at making a significant investment in lenses either in the short or long term, consider the availability of lenses on the used market. Into this equation you may want to consider other things, such as accessories which may be somewhat specialized. Only after you've thought about these things should you then consider what camera body you want, and the decision should be much easier.
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