I can fully appreciate people having differing opinions about cars. I sure as heck would have never bought a Prius a year ago. However, I read up on them and they are excellent cars. The traction batteries cost $2200 or less from dealers. You are allowed to install them yourself for free. It's supposed to be easy, just follow the instructions and don't electrocute yourself.

: After you are done, the battery will be accepted by Toyota for free for proper disposal. The cost to have it installed is around $700. Yes, 3k is not a trivial amount of money, but it is not like you didn't knowingly buy a car that will EVENTUALLY need a new traction battery.
These cars are being driven by normal people with over 100k miles on them everywhere and rarely failing. There are Prius's, Camry's, Highlanders, and Ford Escapes(they licensed the tech from Toyota), being used in major cities as taxis for a damned good reason. Because they work. These taxis are constantly eclipsing 200k miles and still running strong. The statistics are there if you look. Toyota makes excellent cars, and the Prius had to above and beyond excellent to make hybrids mainstream.
As a useful tool for buying a Prius, you can get the traction battery tested to see if it is still charging properly. This $200 test will show whether you will need a new battery or not. If it is still working well at 100k, you should make it to 200k easily.
These cars are not for everyone, but to say that a common service job costs from 160-300% more than it really does isn't very productive. As far as reliability, go ask a Toyota tech what they think. They are the ones who work on these cars and can tell you how reliable they are.
And yes, VW makes a nice diesel engine, they just need to make a decent car to surround it. After what my 2005 TDI put me through, you could never get me to buy ANY VW...
-The engine ate a timing belt at 62k miles and I needed a new head because all the lifters got smashed. $4600
-Ignition snapped and needed a new ignition as well as 2 new outside key cylinders and an ECU. $1900
-Transmission gave out at 66k $3300
-Turbocharger failing with 71k. $1900
-Window dropped. $200
-Headlights decided not to work $300
-Airbag system went out. Free since I was too poor to fix it.
-Cracked connecting rod at 79k, priceless!
Call me jaded but buy a Toyota.
