Hi Federico
I'm facing the same dilemma - finding a really good but inexpensive modern bookshelf which meets my needs. I should say straight off that I'm strictly a music audio user, I'm not into the home theatre thing.
Anyhow, I have the Wharfedale diamond 220s and while they have got better over the two weeks I've run them in, I must say I'm a bit disappointed. My other speakers are 20 year-old Celestion 3s, with a damaged tweeter, and though they don't have the weight and dynamic range of the 220s I still prefer them. They draw you into the sound more, seem more musical and subtle and have a sweet midrange I'm finding hard to track down in a moder £200 speaker. That's not to say they can't kick when the music gets busier - they're also brilliantly rhythmical. I listen to loads of genres of music, rock, jazz, acoustic (on a Marantz m-cr603 which I love) and right now I'm listening to Brahms requiem and just tried both. The Celestions win easily to my ears - the Wharfedales just try too hard.
So, anyway, that's my view of the 220s. I've heard the Q 3020s and I think they do the same modern trick of trying to sound dynamic. I'm going to get a used pair of B&W 601 s2 or s3, hoping that I'll find the same engaging sound in an older speaker as my Celestions but with more power.
I did hear Dali zensor 3 the other day and thought they sounded pretty good, but.... £300! I think used may be the way to go. It would be interesting to hear what others have to say about new vs old budget speakers. I think new designs favour punch over other attributes.
Rob