I'd strongly consider a Berning Siegfried SET ZOTL amp. It is available in either 811 or 300B. The 811 is probably more ultimately accurate, but the 300B is probably warmer and maybe a little fatter overall, and many people would prefer that. Either way, this Siegfried amp is really something. An OTL with true SET topology gives the best of all the worlds, with extension and speed to burn, and the coherence that low power SET amps are known for. I have a custom version of this with the Type 45 output triodes, and it is possibly the best sounding amp of any kind that I've ever heard.
A good single-driver speaker system is made to order for an amp like this. There is a synergy between SET amps and single-driver speakers that is unlike anything else. A good pair to try out might be the Lammhorn 1.8 with the new Lowther drivers. They need a long break-in, but when they are broken in and in a good system, they are great. Other popular ones with Lowthers are Rethm, Beauhorn, and even DIY like the Voigt Pipes you mentioned. That's what I use and I like them alot. Tough to beat a SET/Lowther system for many aspects of sound.
A good single-driver speaker system is made to order for an amp like this. There is a synergy between SET amps and single-driver speakers that is unlike anything else. A good pair to try out might be the Lammhorn 1.8 with the new Lowther drivers. They need a long break-in, but when they are broken in and in a good system, they are great. Other popular ones with Lowthers are Rethm, Beauhorn, and even DIY like the Voigt Pipes you mentioned. That's what I use and I like them alot. Tough to beat a SET/Lowther system for many aspects of sound.