See the data (dogs, cats, fish, etc...) here (INSIDE the spreadsheet, click on tabs, at BOTTOM): http://bit.ly/KIB_BestDogs
Some data tidbits:
Avg. purchase: $423
Lifetime cost: $20,232 (ie, cheaper than most)
Of which food cost is: $4123/lifetime, or $324/year (ie, cheaper than most)
Lifespan: 12.63 years (ie, 85th percentile)
Repetitions to understand new commands: 25-40
Obey 1st command: > 50% of the time
Intelligence/Trainability rank: 49th (ie, about average)
Popularity: 9th (out of 170 dog breeds)
Ultimate ranking: 14th (without kids) or 54th (with kids)