A good friend of mine, PHILNYC, is a dealer of Blue Circle, but I can honestly say it is very good stuff- extremely well balanced, though nothing really sticks out as being any more important than anything else when you listen to it. It's just solid stuff and doesn't butcher attack and timing like so many other tube electronics do- BC, VTL, Atmasphere, and Art Audio are the best tube amps I've heard for this. Lamm or Cary, bless their liquid hearts, couldn't run a rhythmic line through a paper bag. I've not heard the Blue Circle integrated, but I think Phil has one. You can ask him about JM Reynaud and Reference 3a, as I think he has heard both. If you move into the separates of BC- the hybrid ones- I think they would work with a Dulcet fine, but I'd still go for a fully tube design personally. I think an Atmasphere S-30 would be a perfect amp for the MMDCI or Dulcet- the design philosophies are the same- no crossover in the speaker/no output transformer in the amp- super direct sound. Art Audio would also be killer- if I were to do it again, I'd look at these. Also, unless you have a really small room, I'd save your $ and get the MMDCI- I think it's the sweet spot in the line. I found the Royal Virtuoso's more sweet/extended/resolving, but not worth the extra $ to me. The Dulcet's were more ragged sounding to me- even with ASL SET stuff on them.
The Rega you have is cohesive as hell, times like a swiss watch, and embaresses some really expensive gear for musical engagement. It does soundstaging OK, has OK tonal color, but can sound dry- but you'll play air guitar to it, which you won't for others and for me, that matters most, if you want to map out the soundstage, others do it better, but that's not really music, that's spatial artificats/characteristics, which are cool, but don't really matter that much to me.
Wadia- super high resolution CD players. Haven't heard them in too long to comment, but I remeber thinking they sounded good when I was a neophyte.
Honestly, as a stop gap solution speaker, the Twin may be good. The Dulcet and MMDCI require a commitment many aren't willing to make.
BTW, I also listen to everything- but I've lately been on a steady diet of the Stones from Let it Bleed to Exile on Main Street, so I'm ready to shoot up some heroin now- just kidding. If I broke it down exactly- prolly 70% rock/r&B/rap: 20% classical: 10% jazz. Diana Krall- 0%
Michael