Can you follow the crack does it go to the edge? Windshields are weakest at the edge, and when they get a pit or chip here, they can easily crack across the entire viewing area when the temp changes quickly.
I do collision repair and have to carefully inspect every windshield that comes in and mark any damage. I have seen more than a few cases where a windshield is perfectly fine, but after taking the swing from 70 degress to 150 degrees in our paint booth, a crack forms starting from the edge. You can usually spot a chip or crack that originated on the edge.
Back to the topic of replacement...
Safelite is really hit or miss with their installers. Some are real pro's, while others are hacks. The important thing is to be there and supervise the install. If the paint around the windshield frame is scratched anywhere the glue does not touch, it WILL rust and cause possible leaks. This is the number one mistake made in windshield installation. A crack is the paint on the windshield frame can lead to disaster a few years down the road.
As far as quality of the windshield goes, there's only a few out there. PPG is one of the most respected brands, so see if you can find someone who sells those.
I recently sold my Mazda 3. I had 2 non-OEM windshields installed that were not PPG. Both had a swirl-like defect in the passenger view. It was totally un-noticeable unless you were sitting in just the right angle, or knew it was there, then you couldn't stop noticing it.
Bottom line is its really about the install, because that is the part that is most commonly screwed up. I personally will never pay OEM glass prices because I have a direct glass vendor that comes to my shop everyday. You could also call your insurance company and see who they have on their list. You could get a better deal going through insurance even if it is under your deductible, as most insurance companies have a negotiated price with companies like Safelite, that is quite lower than the retail price.