and

Dvorak
Wagner
Mendelson
Brahms
Verdi

If you're looking for a dramatic, powerful composer I'd say Beethoven is the way to go.

He was crazy! And amazing! I've yet to encounter a beethoven piece i don't like (and I've gone through a lot of beethoven, playing and listening to it).

A regular artist
 

If you have never heard of Dax johnson you should look into him. He is more neo classical, but he is very good.

Also Camille Saint-Saëns is one of my favorites. I mostly like the dark side of classical so this is a must if you like that kind of stuff.

Symphony #9 "From the New World" by Dvorak is absolutely amazing and one of my favorite classical pieces, it crescendos better than any piece I have ever played(or listened) to before.

I wouldn't go with William Tell though as mentioned above, it's commercial classical and there are sooo many better pieces out there.

My personal favourites are Chopin and Handel. When I want something loud and booming, any of the Russian composers will do the trick. I especially love Rachmaninov and Stravinsky.

Happy listening!

Try some of chopin's nocturnes.