I think that while 100% view-finder is a very good thing, it is not nearly as important as having a good, bright viewfinder. This is the thing that my D300 has that causes me to wince in pain when I pick up my older D70.
Admittedly, the D70 is seriously weak in the viewfinder area, but I didn't really mind it when it was my primary body. Perhaps that is because I was so jazzed up about it when I first got it - since it is similarly awful compared to my older film bodies - but sheesh, now? It really is awful.