Input on Nikon16-85mm vr and NIkon 18-105mm vr?

I currently own Nikon 18-55mm and 55-200mm vr lenses. I rented a few lenses to try out this week, the Nikon 16-85mm vr, Nikon 70-300mm, and Tamron 90mm. I haven't received the tamron, but tested out the 16-85mm against the lenses I already own. Is it me, but I don't see a huge difference between the quality of photos from my lenses and the 16-85mm which is a lot more expensive? I also can't justify the price when it's only goes down to f/3.5 apt. They should have at least made it a f/2.8! I also noticed that it takes the 70-300 a bit to focus at the long end (300). Is this normal for telephoto? I'm really looking for the best travel lens, along with a macro. I was also looking at the 18-105 vr, since it's a big longer, lighter, and less expensive. Weight, quality of photos, and price (in that order) are my priorities. Any input would help. Thanks!