The commute to our cottage in the backyard is excellent....never any traffic and cheap on gas.
True, kids will swim less when they are older, but now is the time to take the "plunge".
Size: smaller = overall less cost to operate
Shape: rectangular (boring) is easiest for solar blanket.
Depth: Adults usually stand around in the shallow end and talk and drink. (how much deep end do you need when the kids are gone?).
Diving board & Slides: a total liability
Salt - corrosive (heaters - most mfgs don't warranty salt damage)
Cost - $1500 (ave.)
Replace "Cell" $800.00
Salt is banned from Toronto's Storm Sewer System.
Salt is destroying the sewer system and may be banned altogether in the future.
Chlorine: cost $100 - 200 per year
Chlorine is also banned from Toronto's storm sewer system (as are algaecides etc...)
Toronto's Storm Sewer By-Law - Pool waste water.
http://www.toronto.ca/water/protecting_quality/pollution_prevention/swimmingpools.htm
Vinyl cheaper than Fiberglass (initally)
Hybrid vinyl: Galaxy and Champlain models (excellent value)
Fiberglass may last over 30 years - vinyl liner may last 10 years before needing changing.
Vinyl pools are usually deeper than fiberglass.
Electricity - Motors - energy efficient motors may pay for themselves in 3-4 years of usage.
Some brands of pumps only last 5 years (replace not repair).
Heaters: Milivolt vs mid to high effeciency.
Millivolt - cheaper initial cost, less to go wrong, uses more natural gas, no costly electronics to replace.
Certain brands of pumps and filters out last others.
Deck design: accessibility to the skimmer and return fittings (they will eventually leak and need to be dug up).
Although I can not recommend a company, the Pool Council (code of ethics) is a good place to find a builder.
http://www.poolcouncil.ca/
PM me for more info (involved in the pool industry for almost 30 years)