I agree with previous posts that suggest the possibilities are nearly endless. Some would view the world of SET amps as a small niche, in an overall context of High End Audio that/s probably true. However within that special niche it is really something as to the number of SET choices available and many of them good!
Just within the 300b SET group there are multiple choices that span a broad price range. You still have 2A3, 845, 211,PX25 choices aplenty. Then you move on to speakers and there are again numerous choices. Granted that most of these speakers are from small/cottage type of brands but of very good quality. And again covering a wide price spectrum.
Here is one (of many possibilities) example.
Coincident Frankenstein MK III 300b SET mono blocks (I own the older MK II version) ) paired with the superb Cube Audio Nenuphar with single 10 inch driver. Or the same simplifier paired with the lower cost (but highly regarded) Coherent Audio coaxial 2 way with choice of 10, 12 or 15 inch woofer (depends on room size).
Either of these speakers could be driven easily with a 3 watt 2A3 SET if desired. I could go on and on with other combos. Bottom line is there are many,many options available. 845 SETs open up other possibilities.
Charles