When it comes to SUVs I know my stuff. I have driven them all and spent much time comparing them. Here is the order for the top suvs:
1.Cadillac SRX
2.Infiniti FX
3.Touareg
4.MDX
I have no idea why the Cadillac was over looked and not even mentioned. It is THE suv for 2004. The Infiniti is an close second and the Touareg a close third. They all offer their uniqueness and all have something different to offer. The Touareg has its off roading capabilities but thats about it. The Touareg dosent sloutch in any area but the Infiniti and Cadillac are better for the most part. The Infiniti and Caddy are more high class then the Touareg, their designs are sculpted over the Touareg's rugged desing. The Infiniti and caddy offer more versatility on the interior. Infiniti is rated the number 1 automotive company. The Caddy wins mainly because it is a Caddy and comes stocked like a Caddy. This means the designs are pleasing to the eye, easy to use, and offers excellent handling and power not to mention the northstar engine. The northstar is by far one of the best engines in the industry, offering several features the others don't. The caddy is competivly priced with the others. I highly suggest the Cady or Infiniti, but make sure to still try the Touareg for comparison. Go see the Cadillac I guarintee you will love it.
Look at the attached pics, how can you look at them and not go out and buy it. BTW the glass roof you see in the pics is an option. It is a Giant sun roof that opens over the first two rows and darkens at the touch of a button. You can also get the optional solid glass over the third row seat. BTW as far as off roading the Caddy isnt that bad, its not as good as the Touareg but still acceptable for the occasional off roading, it also offers the suspension control height you liked on the Touareg.
Now to answer your question, there are no reliability problems with any of the ones mentioned above and you shouldent expect any. If I had to chose a most reliable I would have to say the MDX and Infiniti are top with the Cadillac and Touareg second.
If you have any questions feel free to ask, you will never find a more informed person.