Trappist ales are those brewed by the Trappist Monks, including about half or my prior list (Maredsous, Grimbergen, La Trappe, etc.). That said, the Rochefort 10 is an excellent beer. This is truly a world-class Quadrupel. Their 6 is a Dubbel, and their 8 is a "Strong Dark Ale". Not sure if they've made a Tripel style, as I've never seen one. Rochefort is not as plentiful as ales from other Trappist breweries in our local bars and distributors.
The Rochefort quad is very similar to my La Trappe Quadrupel (10% ABV) from Bierbrouwerij De Koningshoeven. The quads I can usually find in our local bars and distributors are Kwak, Three Philosophers (local to you, jatoxico), La Trappe, St. Bernardus Abt.12, and Victory V12. Of these, Kwak is probably my favorite, although St. Bernardus Abt.12 is a mean contender, and more highly rated.
http://beeradvocate.com/beer/profile/259/1708/
To anyone who hasn't been enlightened to the joys of Trappist ales, I recommend picking up the St. Bernardus variety pack. At $110, it's a bargain. Give the Wit to your wife, and enjoy the other five brews (Pater 6, Prior 8, Abt.12, Tripel, Watou Tripel). It's the best mix of Trappist ales you'll find in a single box, anywhere.