Air Suspension... the good and the ugly
Ok, so I was in your position just one year ago. I was looking for a pre-owned Touareg V8 with air suspension, parking sensors, navigation, and preferably keyless access. I found an '04 w/ 64k miles that fit the criteria, minus keyless -not a big deal. Major plus was it was black on teak, a very rare interior color w/ very rare options. I was ecstatic.
I've now owned the car for a year, and what a freaking nightmare! First of all I thought I was getting it for a steal at $14,800. HOWEVER, the maintenance costs more than the car is worth. I have replaced my xenon headlights multiple times in the last year, the car ROARS through them. Luckily I learned how to replace them myself -which is pretty easy to do- so it only costs me a whopping $86 every time... at the dealer this would cost well over $200 PER LIGHT!
Additionally, I get a lot of dead batteries, so I took the liberty of replacing the battery myself -which is located under the DRIVERS SEAT!- This only cost me $150 for the battery and the required tools, but took weeks of research and lots of courage... worse yet, it still hasn't fixed my issue. Now I'm thinking it may be a bad alternator cable or battery ground cable. Talk about a nightmare! Additionally, I had to replace my front brakes for $300 (a bargain considering that the stealership will charge you $800), but now I need rears, AND my air suspension light just came on, indicating that there is either a leak in the wiring harness, a faulty sensor, or my biggest fear, a leaky/broken air bag or suspension component. That and the gas light being on -another expensive aspect in this car- and I'm rocking three warning lights (suspension, brakes, gas).
Also, you should know that the V8 ROARS though gas and brakes with a lead foot driver such as myself. All in all, I would say the air suspension was worth my search, as it greatly helps the drive quality and capability of the car, as well as the handling and overall sporty aspect -especially with the powerful V8- however, overall this was the wrong car for a college student living in Colorado. It is extremely costly to own. You can't afford this car if you live on a budget, especially if you plan on getting work done at the stealership. They'll rape you.
Though I do feel that it is important to note that the car equipped with studded snow tires is UNSTOPPABLE in the snow... I mean UNSTOPPABLE!! Cruising on the world's deadliest highway (I70) in a ridiculous blizzard at night on a snow packed freeway passing by car accident after car accident/pileup at 80MPH felt as though there is nothing going on outside. You may call me crazy for doing such a thing, but it felt like I was cruising down the highway on a normal sunny day. This car is something else capability-wise, but it is heavy, inefficient, and very very VERY VERY VERY EXPENSIVE!! AAAAAHHHHH!!!! There is more hate than love, but the love is concrete. *Sigh*
Best of luck to you on your search. Also, I should note that all of the problems that I am experiencing are common, so don't try to brush it off as "oh, he must have gotten the bad VIN out of the batch" that is NOT the case after much research and contact with other frustrated VW owners... car is an expensive POS, but a beautiful, nicely handling, extremely capable one at that. Volkswagen does not stand behind their vehicles. They try to make their customers cum money as much as possible. I've had many arguments over the phone and at the dealer w/ no progress.