Buying new speakers

I’ve been debating various kinds of speakers, and I’m thinking I want to buy some Harmon Kardon speakers. But you know, I’m not all that knowledgeable about sound systems, so I’m not very sure which offer good qualities. Anyway, I really like how these ones look.

My brother is a real sound enthusiast, so I should probably ask him. But you know, he gets all technical on me all the time, so I’m probably not going to even understand what he thinks I should buy! And the stuff he has at his place doesn’t really have such a great look, although it’s definitely fabulous sound.