The speed - The much more pricey garage door opens up much faster, lowering the waiting time on your driveway. The quicker opening version still shuts at a slower speed for safety. Think about how much you are willing to spend for the quicker models.
If you decide to expand your garage to make more room for tools or storage, this is considered adding on to your home, and costs will typically go up. Home addition costs fall between $20,000 and $70,000 for most homeowners, depending on the size and type of space built. Your contractor will frame out new walls and expand the room's foundation. If you intend to keep the space the same only reorganizing it, you may have only the costs associated with purchasing and installing shelving and cabinetry.
This is extremely important! As a home-owner, your home in Dallas may be your most valuable asset by far, right? You may even owe hundreds of thousands of dollars still on your mortgage. (This is written primarily to home-owners, so if you are the owner of a commercial building in Dallas, then the same issues will apply to you except probably with much larger dollar amounts.)