I posted a few thoughts on the Sonata IIIs here at the gone not long ago. Mine were bought brand new direct from Silverline.
Powerwise, Id think your current power train would do very well with the newer version, IIIs. Id also say your bass will improve substantially. Well into the midrange too Id say as well the top end will be improved too.
As it stands now in my rig, Im not looking to change anything major. Just cables maybe. .. or a power cord for the preamp.
Ive used them with several amps, SS and tubes, and each power line had its own characteristics and presentation. My Dodds are arranged so the midrange is more pronounced given the array of tubes they have on board. They have sufficient speed and extension.
With the Odyssey Stratos SE, things are more evenly set across the bandwidth, and they produce better/tighter bass, yet lack the body that the tube mono blocks provide throughout the bandwidth.
With a Rotel 200wpc stereo amp (1080 I believe I borrowed from a friend), the bottom end was more emphasized and the top end was a bit more strident. The tweeter in the Sonata IIIs is an exceptionally good Dynaudio unit, and it helped out with that amps song.
The presentation with either my Sony or ONkyo receiver are similar to the Stratos SE, yet not quite as well articulated and defined but with the same extension. The Sony having more pronounced bass lines, and the Onkyo being more balanced and refined overall or more musical sounding, to use a overly used term.
Ive had a fair number of speakers, (BW, Monitor Audio, Phase Tech, VSA, Yamaha, Sony, Canton, Bertagni, etc) and heard a good number of others out there. The Silverline Sonata IIIs sit at or just above the median in speakerage, and one will have to move a goodly ways on up the speaker food chain to better them overall. IMHO In the close to but under $8K MSRP they present a very very, good selection.
In the $4K to $5K real world price range, for a mid sized, one foot square foot print, 40 inch tall, finely finished, good looking, inobtrusive, easily placed, great sounding, high fun factor speaker system, that can handle any sort of music and does very very well in an HT setup too.
Do get the largest spikes offered right off.
Were I to do it all over again, Id only make one other change to them Id have gotten a different color. Or given a WHOLE LOT more thought to my redecorating choices. Mine are Piano gloss Maple. Not exceptionally well suited for an HT setup with a 115 inch screen 3 to 4ft. behind them . But do-able for sure, I must say. Likely any piano gloss would have been a slight issue there. A fix was cutting out a thin piece of material and laying it over the top and sides to eliminate the reflective light coming off the screen.
They sit on the 14 ft wall in a roughly 14 x 21 x 8.3 closed off room, close to eight feet apart.
Hope that helped