The E-1 has a 2.0x crop factor, yes? So the lens is 28-108mm equivalent on 35mm, so assuming a 1.5x crop factor for nikon you're looking at 18-70 ish.
There's quite a few options for that range including, obviously, the uber-cheap (around £60) 18-70mm 3.5-4.5, although that will lose some...