Upgrade body or buy a new lens? (Nikon)?

I have a Nikon D3100 for about a year now and 35mm f/1.8G with it. I'm was impressed with this lens til now the Chromatic Abberation seem to bug me recently with post processing. I also have some other lenses like the 16-85mm and the kit lens (18-55mm VR).

I'm wondering, should I waste my money on a new body like the D7000 (or when the replacement comes out) or would taking photos with the 35mm f/1.8G on either bodies will provide me same results?

My options are: Buy D7000 (or replacement this January) or Buy a better lens (28mm f/1.8G or 24-85mm f/3.5-4.5G)?

Since you have a perfectly fine camera, you need to start looking for new practical lenses that will cover the images you tend to shoot.

I don't know why you bought a 35 mm lens.

Your D3100 can use ANY Nikkor AF-S or AF-I lens.

If you do buy the D7000, it will use ANY AF, AF-I or AF-S lens

Only you can know what you should do.

I would be saving my pennies to buy more lenses. In the time since I first bought a dSLR, I have purchased five lenses.

Lenses last for decades. You will find you will be replacing camera bodies about every four to five years.

Your complaints are all about lenses. Buy lenses instead. You seem hell-bent to replace your kit lens though. 16-85 pretty much seems a direct replacement and the 24-85 is not far from it. Yes, if you are after the best in optical quality, buy prime lenses only.

Doesn't simply choosing the correct lens profile nearly automatically fix the CAs in Lightroom? What do you use as a post processing software?

Zooms very rarely perform better than primes when it comes to things like CAs. Some higher tier DSLRs (D90, D7000 and upwards) automatically correct some CAs when shooting JPG right in the camera though… But if you want to shoot RAW, then that's a non-issue.

So… My recommendation would be to fix this in Lightroom.