To 1031 Exchange or Not to 1031 Exchange Tax Question

[James Park]

I wanted open this questions to @Brandon Hall or other BP investors who have experience with 1031 exchange.

Suppose that i have a property in Chicago that i purchased for $400,000. Over the years, I have taken a depreciation to offset my income on schedule E of $25,000.  I sell this home for the same price I purchased it, I would then have a basis of $375,000. I would guess that I would then have a tax liability of $3750 (25,000 * .15 capital gains tax). Let's say that after my closing costs, fees, and mortgage I net $100,000 from the sale of my Chicago. 

Here are my questions:

1) If I reside in GA, will I have any tax implications with the state of IL?   

2) If i identify a investment property in GA and I use the entire $100,000 proceeds from my Chicago property and additional funds to buy the property with cash, would this be a transaction I can defer my taxes.

3) With a small capital gains tax of $3750, would a 1031 exchange be advisable?

One important information I would like to add is that this was a primary residence that turned in a rent in the summer of 2011.

Thanks.

James