What kind of lens do i need?

I'm getting a Nikon D70 tomorrow (body only) What would be the first lens i should buy for it?

Nikkor 18-55 if you want cheap
Nikkor 18-105 if you want to spend a little more and get more range
or Nikkor 18-200, expensive, but a very good general zoom lens

The kit lens should do but most new dSLR users don't seem to appreciate it having experienced lavishing zoom ranges with point-and-shoot cameras. If you are tight on the budget, be contented with the 18-55mm kit lens. If you have more to spend and want the same single lens do-it-all like your old point-and-shoot, get a longer zoom like the 28-300mm.

My D70 came with a 18-70mm f/3.5-4.5, which was better I think than the 18-105mm f/3.5~5.6 that is now kitted with the D90 and D7000.

It really depends on your needs.

Is this your first (of many) DSLR, and are you looking to build a system?

Do you want this to be a one-lens camera and not have to change lenses out.

If the former, start out with a 35mm f/1.8 or 50mm f/1, 8, as this will form the anchor for your remaining lenses. It is not necessary to cover every millimeter with a zoom, and with this lens, you can eventually add a super-wide angle, such as a 11-16mm f/2.8, and a good zoom, such as a 70-200 f/2.8 or 80-200 f/2.8.

Those lenses will be high performin, and perhaps a bit overkill for the D70, but with the realization that you will replace the D70 at some point, you will have a killer system.

If all you are looking for is a single main lens, then a 18-105mm or 18-200mm is what you will want.

So the zoom lens gives you flexibility now, the prime gives you flexibility later (but you could always do both).