Which Hi-end monitor for near field listening

Beheme, I think neutrual sounding mid is the best : )
Most of monitors has good sweet spot for mid. Some just sound less weight than the other. As far as tweeter choice goes, I think the crossover design in these speakers is probably more critical than the tweeter themselves. However, if I have to choose, I'll probably go with silk dome type or ribbon type for the small monitor speakers. They're more easy on my ears.

Any correlation between sensitivity and tonal balance? over the years, I found most high sensitivity speakers I listened to to be rather "thin" but again they were mostly French: JM Lab, Triangle, Cabasse...and other in the 86-89 db to be thicker Sonus Faber, Dynaudio, Audio Physics, Opera...is there any correlation? should I continue my search toward higher sensitivity (92-94db) monitors then...and go silk / ribbon tweeter? Any recommendation that would meet both?

No correlation between sensitivity and tonal balance.
It has to do with crossover design again.
I'm using 94db large coxial speakers on my second system and they sound very full.
My friend using 100+ db JBL and Altec horns and they sound just fine too.
It really depends on room accoustics and size limitations to determine what's the right speakers for you.
If you insist on getting high efficiency speakers ( 92db + ) then you can look into something like Reference 3A MM DeCapo.
Due to the physical space and tonal balance of the speakers, I would generally choose the speakers first and then find the right amp to match. This makes things easier.

From the spec, they should be very easy to drive and match well with most of the amps. They just sound thiner than what we would like. Also, the lower frequency is just not there. Lack of clarity and no punch. You would wonder where is the bass as it claims 38 Hz vs 55 Hz of ATC. Again, these are just our opinions so you can choose whatever you prefer.

Needless to say, this has not been my experience at all with the SR17's and I've owned two different pairs (one of the earlier models, and currently a recent one). Nothing in your description of them resembles my impressions of them so I imagine it may be a matter of synergy. Either that, or your friend did not allow them to break in long enough as, by all accounts, they do have a long break-in period. I've used them with about five different amps, both tubes and SS. I did experience some lack of low end using the Pass Labs Aleph 5 with them, but I do think that was a drawback of that particular amp. My favorites have seemed to bring more muscle to the task: Mesa Baron and currently a Portal Panache. In spite of having heard more than once that the SR17's are voiced for tubes, I have not found that I like them as much with the lower powered tube amps I've tried them with, but they were still great performers here...just better with more power behind them IMO. Those amps were Quicksilver Mini-Mites, Quicksilver EL34 Triode Prototypes, and a revamped Scott 299C (going from 35W to 17W respectively). I'm pretty sure I've read all the online reviews and comments on Internet forums on these monitors and absolutely none reflect the same experience you and your friend had, so I'd have to guess something was amiss there. Regardless, I'll definitely look to check out those ATC's sometime...sounds like a worthy candidate!

Marco

In terms of amps and Silverline speakers: I'm getting great results from using a hybrid intergrated with a tubed pre and SS amp. Silverline does 'like tubes', but it also benefits from amps that control the bass well. Not that these two things are always mutually exclusive, of course...