I lived in Keller up until a few years ago. We just purchased a house in Trophy Club. Trophy Club is typically a little pricier, but it's a nicer area and a much easier commute for really anywhere in the Metroplex, IMO. Don't get me wrong, both areas are great, and both Keller & Northwest ISD (TC's) are great.
Like was said, they finished the highway expansion between Grapevine and Las Colinas. It was for a managed toll lane though, but if you get a toll tag, the commute is a breeze from Trophy Club. They're working on adding managed lanes all the way to just north of downtown Dallas, so that commute is getting better. For Fort Worth (my typical commute), you can go 121 straight into downtown and avoid the I-35W mess. Once 35 is done, that would be another managed toll option, if you need it.
If you need a realtor, let me know, and I can get you in contact with mine. She's become very familiar with Trophy Club over the past couple of months.
Best of luck, and feel free to message me if you need any advice.