great little speakers

In Belgium there's no problem to buy B&W, but alternitive's
such as Harbeth or Spendor are hard to find.
I can order Spendor in 2 or 3 shop's in Belgium,no Harbeth,
and nobody cares, strange.
I consider the Spendor S3/5 but will they match well
with a modest Rotel amp (60 Watt) and NAD player?
Experiences welcome.

Yes, the S3/5, even at 84dB/w sens will get pretty dynamic with the Rotel. For greater extension and slam you should look at the 88dB bigger (6.5", 165mm) S1/3P, or even the now-discontinued great SC3 center channel, turned sideways.
It's exactly like a double-woofer S3/5, also at 88dB, vented for deeper extension. Both options list for $1400/pr.
Any of these three Spendors will have a more honest midrange and more forgiving top end than any B&Ws. Warmer than the Triangles, too, if that's a reference you know....

I use original KEF Q15s in my recording studio and they are fantastic for the price ($250/pair).

I have the P3 in my main music system, and the Dynaudio Audience 50 in my home theatre system. Powered by Densen DM10 amp, Quad 77 CD player and Kimber 8TC cables. When I first replaced the Dyns with the P3s, I was struck by how much smaller and narrower the soundfield became.

But I decided to keep the P3s in the main system because there was more detail and I could hear more layers in the music. The P3s made it much easier to track different musical instruments and voices. They made music sound more immediate (and therefore exciting), too.

The Dyns, on the other hand, is more versatile - it works with a wider range of music. The dispersion range is bigger. For home theatre, the P3s are better with dialogue, but the Audience 50 are better with sound effects.

The best (and one of the smallest) "little speakers" that I have auditioned (and which I purchased for my office system) are the ProAc Tablette Reference 8 Signatures. I think that they do a great job of satisfying your goal of "cohorent, smooth, not over- analytical sound" in a very small, very tidy package. I also liked the Totem Model 1 Signatures, but I found the ProAcs to be more musically compelling.

Tom.