I am a partner in a landscape architecture firm that specializes in the design & construction of high end swimming pools. We consult on and design pools all over the United States and we build mostly in central Texas. I also built my own custom gunite swimming pool 3 years ago.
The biggest thing to remember with installing a swimming pool is that you get what you pay for. A typical residential swimming pool can run $35,000 - $500,000 or more. I wouldn't recommend anything other than a gunite (concrete) swimming pool. With fiberglass or vinyl liner you are very limited in design and they have a much shorter overall lifespan. A well constructed gunite pool will last forever and it can be customized to your individual taste and to the architectural style of the home. Additionally, you will see a much higher return on investment.
Do your research on sanitation options. A saltwater pool has just as much chlorine as a traditional chlorine pool. It just delivers the chlorine in a different way. The salt is a water softener and it increases buoyancy. Some people really like the way salt water feels, but it is very corrosive. It will limit your choices for materials (no limestone coping or decking, no cast aluminum or steel furniture). It will also shorten the life span of your circulation & filtration equipment. For most residential pools, I recommend a simple chlorine tablet feeder in conjunction with an AOP ozone generator (Dell AOP). This will significantly reduce the amount of chlorine you need to sanitize your pool and will give the water a clean fresh smell.
We work with a lot of real estate agents and custom home builders. Based on their input and my experience, I would tell you to expect an overall return on investment in all outdoor improvements up to 20% of the home value. This includes planting, irrigation, pools, outdoor kitchens, shade structures, etc. So if you live in a $350,000 home, you can expect to get up to $70,000 back in increased property value on outdoor improvements.
If a pool is designed and built properly it can be easy to care for and it will not be overly expensive to maintain. Hydraulic design is very important. Maintaining water velocities below 6 feet / second will allow the pumps to run very quietly, efficiently and it will help to reduce any risk of suction entrapment. Beware any contractor that specifies all 1 1/2" or even all 2" plumbing. For instance, when in filtration mode (In-floor cleaning system / water features not running) I am burning 160 watts, which is less than 2 light bulbs. If you hire a weekly maintenance service, they will bill you in the neighborhood of $200 - $400 / month including chems. If your contractor uses a quality equipment brand (Jandy or Pentair) you will get a 3 year warranty on all of the circulation / filtration equipment.
If you do build a pool, make sure that you have a qualified contractor. There are some great builders out there, but there are some very bad ones as well. At the very least make sure that you hire an APSP certified building professional. Genesis certification is even better, but there are fewer builders who have this. Ask for references, and call to speak with previous clients to hear about their experience before signing a contract.