All the hi-fi speakers I have ever listened to sound good to me. There are certainly differences, and I prefer some over others.
So much depends upon listening habits, room acoustics, and system synergy. System synergy is the easiest to tackle, as most modern equipment is designed to work within standard parameters. It is fun and rewarding to learn the electronics required to make informed component decisions based on specifications and actual performance.
Listening habits will help you determine whether you want a warm sound for cozy vocals and a lush musical presentation, or if you prefer a more analytical and accurate reproduction of music (It's really a spectrum, with anything in-between possible). This is where the value of good dealers comes in. You really need to listen to different systems.
In addition to sonic preferences, listening volume will also help determine speaker choice. I use Harbeth P3esr speakers in my 13' x 22' office/sitting room (some help from an REL sub). Works fine for me, but I do not blast my music. The Compact 7s probably fit my room better, but I found that the exquisite sound of the P3s (and their sealed box design, which is very forgiving when it comes to placement) is simply delightful for my application.
Room acoustics is probably the most difficult undertaking. There is a lot to consider here, from reflections and resonances to aesthetics and practical considerations. If you start with speakers you like, you will have an easier time figuring out where they should go and how you should treat your room.
You stated up front you like the Harbeths. Take a look at the line and figure out which ones will work best for your application. You will be happy!
