This is kind of a difficult question because the world of classical music is so *enormous*. And there so different categories too like baroque, romantic era, 20th century, etc...
If you love the orchestra and want to see how an orchestra can kick some serious ass, I would recommend Mahler and Aaron Coplend with your headphones. In my opinion, it's primarily the 20th century stuff that has the most interesting and dynamic stuff of the orchestra. You can try other 20th century composers as well. I love Ravel too. The Star Wars Empire Strikes Back soundtrack is excellent even though it's a film score. Be open minded with 21st century composers too. Sometimes I am suprised by new works when I listen to a classical music station on the radio.
One of my all time favorite kick ass recordings is Richard Strauss's Alpine Symphony. This is a monumental work and I love the recording with Karajan conducting. It's overwhelming like a tidal wave!
http://www.amazon.com/gp/product/B00...=glance&n=5174
Sometimes I'm not in the mood for an orchestra and I will enjoy string quartets. The Beethoven String Quartets are one my all time favorite works in classical music. I love it. Many will say that his late quartets are the best. But I love them all. In my opinion, his string quartets are his finest compositions.
Another favorite is the Shostakovich String Quartets. These are very different from Beethoven string quartets but they are the most emotional works I have ever heard. Alot of the music is so deep and tragic. Heart breaking and to me, it's arguebly the most profound works in the classical music world.
When it comes to Mozart, I enjoy alot of his stuff but one of my favorite recordings is the Divertementi CD with Ton Coopman conducting. It's a fun listen and really beautiful.
http://www.amazon.com/gp/product/B00...=glance&n=5174
Also, try to listen to Bach's Brandenburg Concerto's. They are wonderful and very famous.
Generally, when it comes to Bach, Mozart and other early periods of classical music, I usually prefer recordings done with period instruments. Period instruments are the kinds of violins that they used in the old days. They sound warmer and have a more rich tone. They sound less abrasive. But there are good recordings done with the regular violins of today too.
A good way to listen to a bunch of classical recordings it to go to your library and see if they loan classical CDs. My library has a modest selection and I have found lots of great gems. Also, try the Naxos label too. They have a lot of very nice recordings for around $6 I think.
Keep in mind that price has nothing to do with the quality of performance or work. There are many great recordings that are cheap CDs and you can always read the reviews. But keep in mind that it's your ears that decide what's good, not other people's opinions.