Last week I sold my E1 and replaced it with an E2. Some comments based on my native lens pool:
14/2.8, replaced with the 16 for more versatility with my shooting. Superb lens, quick AF, small enough to not think about it.
16/1.4, awesome. Fast AF, lovely draw, close focus, versitile if you shoot wide. Balances surprisingly well with just a thumb grip. My second favorite lens.
18/2, my favorite lens. Lovely draw, focuses quick on the E1, not subject to hunting as in will lock focus on near anything even when the light gets low. Nice size for the body. Good indoor and close up lens. If specs are important take a pass. If photography is important and the FL is desirable, don't think twice, just get it. Spotty build quality.
23/1.4, a great lens. If that focal is important to you, a must have.
27/2.8, nice and compact. Can't focus close, ok AF, some hunting in low light, often too tight for indoors, a good compact carry for walking around without a mission. My wife's lens, I'd rather have an 18/35 combo even if it's more money and a second lens in my pocket.
35/1.4, I'd take a pass with an E1. AF in good light is fine. When the light gets the least bit dim it hunts, a lot. I've read the new 35/2 is much faster and quieter. Noisy, spotty build quality. I use mine only on the XT1, I've found its picky on the E2 as well. Unfortunate as its a superb lens.
xf18-55, solid general purpose zoom.
xc16-55, solid general purpose zoom. Slower than the above, a bit more delicate draw, cheap and light.