Alex -
I had the 35-70/3.3-4.5 zoom for a while and it was nice and compact, but image quality wasn't too great. Close-up (sorta macro) capability at 1:4.4 was handy, but the build quality had more plastic than most other AI/AIS lenses.
For such a limited zoom range, you'll get much better images with a 50/1.8, or a 55/3.5 if you want macro. Just use your legs as your zoom.
If you really want a mid-range zoom and can handle a bit larger lens, the 28-85/3.5-4.5 is pretty good overall, both in the MF and AF versions. If you want more reach, the 35-105/3.5-4.5 is good at the longer end, but not great at the wide end. The one lens I'd be leery of is the 43-86/3.5. The early versions were bad (mine was) but they supposedly improved when the AI version came out.
Keep in mind that the Nikon mid-range zooms can have a lot of sample variation from lens to lens. Some are great at the wide end and others at the longer focal length, and vice-versa. Some lenses will also perform better or worse if they are stopped-down or wide-open. My copy of the 35-70/3.5 lens is great, except at 70mm wide open (ick!). Stop down to f8 and it's great again.
But if light and small is your main goal, IMHO you'll probably be happier with a fixed 50 or 55mm lens.