MangoMonkey:In terms of speaker choice, I'm thinking of the Rega R5, the Naim nSats or the Monitor Audio Rx6.
I have used Rega R3s and Naim nSATs with my Naim system and enjoyed them both in different ways.
A lot depends on room size, furnishings and preferences in music.
I found the nSATs suited my taste for BBC radio (mostly speech and drama/documentary) and Bebop Jazz, Reggae, retro pop, light classical etc. Probably not the best choice for high energy, bass-laden music or heavy metal. They really do match superbly with Naim amplification and sources and exhibit great immediacy and presence. Beware that there is a lot of 'lore' about nSATs that is passed on without scrutiny or the benefit of personal experience. Use them within their parameters in a small or medium room, very near the walls, away from corners, on good stands, with no furniture between them, and I think you might 'get' what they are about. Expect them to do the same job as a big floorstander and you will be dissappointed.
The Rega R3s (and probably the R5s given the commonality of the mid and treble drivers and basic design) are more 'fruity' and have more bass - obviously - but they do a 'workmanlike' job. No shocks, no suprises, just a consistently good job. A comfortable 'fit and forget' type speaker with no particular vices. If you analyse the bass you'll find the same - very slight - tendency to one-note monotony common to a lot of ported floor-standers, but this is not usually a problem if you are used to ported designs already, and it suffers from the tendency much less than others.