2014 Toyota Prius 2 $18251 with 7yr/100000 power train warranty. Is this a good deal?

If you have good credit I would lease one, at least you are not committing yourself to long term debt. Year end deals are already up for grabs now. At the end of the day, with depreciation leasing is much more competitive and makes more sense. plus you are always riding new car worry free during the lease term, and there are no maintenance expenses ever except changing oil!

If you lease a new car every time your old lease runs out, you're in an even LONGER term debt than if you bought the car. And unless you're self employed, you can't deduct the payments.