I bought out my lease on the Mazda5 as well. In the three leases I have done, this is the first car I have still wanted. The other leases were on a 97 Civic, and a 98 Integra. The Honda and Acura leases worked out great financially, as I was way over mileage on both of them, but the cars higher resale value than the residual value made it very easy to trade the car in when I was ready for another without getting dinged hard at the end of lease term.
For the Mazda5,the trade in value was identical to my residual payoff, and I couldn't see giving it up. So I decided to just buy the darn thing.(screwy)
I also opted for the Mazda warranty, and was able to haggle the warranty price, as well as the jack up the term length, and bring the deductible cost to 0. There is also a place online where you can buy a factory warranty directly, however I do not remember the name of it.(scratch)